diff --git a/src/Basic_Requirement_Checker.php b/src/Basic_Requirement_Checker.php
index 40b7aef905a8176e31e55362110841e9de34797e..7feeb269338cf69f7aafb859b5fc1fafe225a323 100644
--- a/src/Basic_Requirement_Checker.php
+++ b/src/Basic_Requirement_Checker.php
@@ -1,509 +1,607 @@
 <?php
-
-if ( ! interface_exists( 'WPDesk_Requirement_Checker' ) ) {
-	require_once 'Requirement_Checker.php';
-}
-
-if ( ! class_exists( 'WPDesk_Basic_Requirement_Checker' ) ) {
-	/**
-	 * Checks requirements for plugin
-	 * have to be compatible with PHP 5.3.x
-	 */
-	class WPDesk_Basic_Requirement_Checker implements WPDesk_Requirement_Checker {
-		const EXTENSION_NAME_OPENSSL = 'openssl';
-		const HOOK_ADMIN_NOTICES_ACTION = 'admin_notices';
-
-		const PLUGIN_INFO_KEY_NICE_NAME = 'nice_name';
-		const PLUGIN_INFO_KEY_NAME = 'name';
-
-		/** @var string */
-		protected $plugin_name;
-		/** @var string */
-		private $plugin_file;
-		/** @var string */
-		private $min_php_version;
-		/** @var string */
-		private $min_wp_version;
-		/** @var string|null */
-		private $min_wc_version = null;
-		/** @var int|null */
-		private $min_openssl_version = null;
-		/** @var array */
-		protected $plugin_require;
-		/** @var array */
-		private $module_require;
-		/** @var array */
-		private $setting_require;
-		/** @var array */
-		protected $notices;
-		/** @var @string */
-		private $text_domain;
-
-		/**
-		 * @param string $plugin_file
-		 * @param string $plugin_name
-		 * @param string $text_domain
-		 * @param string $php_version
-		 * @param string $wp_version
-		 */
-		public function __construct( $plugin_file, $plugin_name, $text_domain, $php_version, $wp_version ) {
-			$this->plugin_file = $plugin_file;
-			$this->plugin_name = $plugin_name;
-			$this->text_domain = $text_domain;
-
-			$this->set_min_php_require( $php_version );
-			$this->set_min_wp_require( $wp_version );
-
-			$this->plugin_require  = array();
-			$this->module_require  = array();
-			$this->setting_require = array();
-			$this->notices         = array();
-		}
-
-		/**
-		 * @param string $version
-		 *
-		 * @return $this
-		 */
-		public function set_min_php_require( $version ) {
-			$this->min_php_version = $version;
-
-			return $this;
-		}
-
-		/**
-		 * @param string $version
-		 *
-		 * @return $this
-		 */
-		public function set_min_wp_require( $version ) {
-			$this->min_wp_version = $version;
-
-			return $this;
-		}
-
-		/**
-		 * @param string $version
-		 *
-		 * @return $this
-		 */
-		public function set_min_wc_require( $version ) {
-			$this->min_wc_version = $version;
-
-			return $this;
-		}
-
-		/**
-		 * @param $version
-		 *
-		 * @return $this
-		 */
-		public function set_min_openssl_require( $version ) {
-			$this->min_openssl_version = $version;
-
-			return $this;
-		}
-
-		/**
-		 * @param string $plugin_name Name in wp format dir/file.php
-		 * @param string $nice_plugin_name Nice plugin name for better looks in notice
-		 *
-		 * @return $this
-		 */
-		public function add_plugin_require( $plugin_name, $nice_plugin_name = null ) {
-			$this->plugin_require[ $plugin_name ] = array(
-				self::PLUGIN_INFO_KEY_NAME      => $plugin_name,
-				self::PLUGIN_INFO_KEY_NICE_NAME => $nice_plugin_name === null ? $plugin_name : $nice_plugin_name
-			);
-
-			return $this;
-		}
-
-		/**
-		 * Add plugin to require list. Plugin is from repository so we can ask for installation.
-		 *
-		 * @param string $plugin_name Name in wp format dir/file.php
-		 * @param string $version Required version of the plugin.
-		 * @param string $nice_plugin_name Nice plugin name for better looks in notice
-		 *
-		 * @return $this
-		 */
-		public function add_plugin_repository_require( $plugin_name, $version, $nice_plugin_name = null ) {
-			$this->plugin_require[ $plugin_name ] = array(
-				self::PLUGIN_INFO_KEY_NAME      => $plugin_name,
-				'version'                       => $version,
-				'repository_url'                => 'http://downloads.wordpress.org/plugin/' . dirname( $plugin_name ) . '.latest-stable.zip',
-				self::PLUGIN_INFO_KEY_NICE_NAME => $nice_plugin_name === null ? $plugin_name : $nice_plugin_name
-			);
-
-			return $this;
-		}
-
-		/**
-		 * @param string $module_name
-		 * @param string $nice_name Nice module name for better looks in notice
-		 *
-		 * @return $this
-		 */
-		public function add_php_module_require( $module_name, $nice_name = null ) {
-			if ( $nice_name === null ) {
-				$this->module_require[ $module_name ] = $module_name;
-			} else {
-				$this->module_require[ $module_name ] = $nice_name;
-			}
-
-			return $this;
-		}
-
-		/**
-		 * @param string $setting
-		 * @param mixed $value
-		 *
-		 * @return $this
-		 */
-		public function add_php_setting_require( $setting, $value ) {
-			$this->setting_require[ $setting ] = $value;
-
-			return $this;
-		}
-
-		/**
-		 * Returns true if are requirements are met.
-		 *
-		 * @return bool
-		 */
-		public function are_requirements_met() {
-			$this->notices = $this->prepare_requirement_notices();
-
-			return count( $this->notices ) === 0;
-		}
-
-		/**
-		 * @return array
-		 */
-		private function prepare_requirement_notices() {
-			$notices = array();
-			if ( ! self::is_php_at_least( $this->min_php_version ) ) {
-				$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run on PHP versions older than %s. Please contact your host and ask them to upgrade.',
-					$this->get_text_domain() ), esc_html( $this->plugin_name ), $this->min_php_version ) );
-			}
-			if ( ! self::is_wp_at_least( $this->min_wp_version ) ) {
-				$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run on WordPress versions older than %s. Please update WordPress.',
-					$this->get_text_domain() ), esc_html( $this->plugin_name ), $this->min_wp_version ) );
-			}
-			if ( $this->min_wc_version !== null && $this->can_check_plugin_version() && ! self::is_wc_at_least( $this->min_wc_version ) ) {
-				$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run on WooCommerce versions older than %s. Please update WooCommerce.',
-					$this->get_text_domain() ), esc_html( $this->plugin_name ), $this->min_wc_version ) );
-			}
-			if ( $this->min_openssl_version !== null && ! self::is_open_ssl_at_least( $this->min_openssl_version ) ) {
-				$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without OpenSSL module version at least %s. Please update OpenSSL module.',
-					$this->get_text_domain() ), esc_html( $this->plugin_name ),
-					'0x' . dechex( $this->min_openssl_version ) ) );
-			}
-
-			$notices = $this->append_plugin_require_notices( $notices );
-			$notices = $this->append_module_require_notices( $notices );
-			$notices = $this->append_settings_require_notices( $notices );
-
-			return $notices;
-		}
-
-		/**
-		 * @param $min_version
-		 *
-		 * @return mixed
-		 */
-		public static function is_php_at_least( $min_version ) {
-			return version_compare( PHP_VERSION, $min_version, '>=' );
-		}
-
-		/**
-		 * Prepares message in html format
-		 *
-		 * @param string $message
-		 *
-		 * @return string
-		 */
-		protected function prepare_notice_message( $message ) {
-			return '<div class="error"><p>' . $message . '</p></div>';
-		}
-
-		public function get_text_domain() {
-			return $this->text_domain;
-		}
-
-		/**
-		 * @param string $min_version
-		 *
-		 * @return bool
-		 */
-		public static function is_wp_at_least( $min_version ) {
-			return version_compare( get_bloginfo( 'version' ), $min_version, '>=' );
-		}
-
-		/**
-		 * Are plugins loaded so we can check the version
-		 *
-		 * @return bool
-		 */
-		private function can_check_plugin_version() {
-			return did_action( 'plugins_loaded' ) > 0;
-		}
-
-		/**
-		 * Checks if plugin is active and have designated version. Needs to be enabled in deferred way.
-		 *
-		 * @param string $min_version
-		 *
-		 * @return bool
-		 */
-		public static function is_wc_at_least( $min_version ) {
-			return defined( 'WC_VERSION' ) &&
-			       version_compare( WC_VERSION, $min_version, '>=' );
-		}
-
-		/**
-		 * Checks if ssl version is valid
-		 *
-		 * @param int $required_version Version in hex. Version 9.6 is 0x000906000
-		 *
-		 * @return bool
-		 * @see https://www.openssl.org/docs/man1.1.0/crypto/OPENSSL_VERSION_NUMBER.html
-		 *
-		 */
-		public static function is_open_ssl_at_least( $required_version ) {
-			return defined( 'OPENSSL_VERSION_NUMBER' ) && OPENSSL_VERSION_NUMBER > (int) $required_version;
-		}
-
+	
+	if ( ! interface_exists( 'WPDesk_Requirement_Checker' ) ) {
+		require_once 'Requirement_Checker.php';
+	}
+	
+	if ( ! class_exists( 'WPDesk_Basic_Requirement_Checker' ) ) {
 		/**
-		 * @param array $notices
-		 *
-		 * @return array
+		 * Checks requirements for plugin
+		 * have to be compatible with PHP 5.3.x
 		 */
-		private function append_plugin_require_notices( $notices ) {
-			if ( count( $this->plugin_require ) > 0 ) {
-				foreach ( $this->plugin_require as $plugin_name => $plugin_info ) {
-					$notice = null;
-					if ( isset( $plugin_info['repository_url'] ) ) {
-						$notice = $this->prepare_plugin_repository_require_notice( $plugin_info );
-					} elseif ( ! self::is_wp_plugin_active( $plugin_name ) ) {
-						$notice = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without %s active. Please install and activate %s plugin.',
-							$this->get_text_domain() ), esc_html( $this->plugin_name ),
-							esc_html( basename( $plugin_info[ self::PLUGIN_INFO_KEY_NICE_NAME ] ) ),
-							esc_html( basename( $plugin_info[ self::PLUGIN_INFO_KEY_NICE_NAME ] ) ) ) );
+		class WPDesk_Basic_Requirement_Checker implements WPDesk_Requirement_Checker {
+			const EXTENSION_NAME_OPENSSL = 'openssl';
+			const HOOK_ADMIN_NOTICES_ACTION = 'admin_notices';
+			const HOOK_PLUGIN_DEACTIVATED_ACTION = 'deactivated_plugin';
+			const HOOK_PLUGIN_ACTIVATED_ACTION = 'activated_plugin';
+			
+			const PLUGIN_INFO_KEY_NICE_NAME = 'nice_name';
+			const PLUGIN_INFO_KEY_NAME = 'name';
+			const PLUGIN_INFO_VERSION = 'version';
+			const PLUGIN_INFO_FAKE_REQUIRED_MINIMUM_VERSION = '0.0';
+			const PLUGIN_INFO_APPEND_PLUGIN_DATA = 'required_version';
+			const PLUGIN_INFO_TRANSIENT_NAME = 'require_plugins_data';
+			const PLUGIN_INFO_TRANSIENT_EXPIRATION_TIME = 16;
+			
+			/** @var string */
+			protected $plugin_name;
+			/** @var string */
+			private $plugin_file;
+			/** @var string */
+			private $min_php_version;
+			/** @var string */
+			private $min_wp_version;
+			/** @var string|null */
+			private $min_wc_version = null;
+			/** @var int|null */
+			private $min_openssl_version = null;
+			/** @var array */
+			protected $plugin_require;
+			/** @var array */
+			private $module_require;
+			/** @var array */
+			private $setting_require;
+			/** @var array */
+			protected $notices;
+			/** @var @string */
+			private $text_domain;
+			
+			/**
+			 * @param string $plugin_file
+			 * @param string $plugin_name
+			 * @param string $text_domain
+			 * @param string $php_version
+			 * @param string $wp_version
+			 */
+			public function __construct( $plugin_file, $plugin_name, $text_domain, $php_version, $wp_version ) {
+				$this->plugin_file = $plugin_file;
+				$this->plugin_name = $plugin_name;
+				$this->text_domain = $text_domain;
+				
+				$this->set_min_php_require( $php_version );
+				$this->set_min_wp_require( $wp_version );
+				
+				$this->plugin_require  = array();
+				$this->module_require  = array();
+				$this->setting_require = array();
+				$this->notices         = array();
+			}
+			
+			/**
+			 * @param string $version
+			 *
+			 * @return $this
+			 */
+			public function set_min_php_require( $version ) {
+				$this->min_php_version = $version;
+				
+				return $this;
+			}
+			
+			/**
+			 * @param string $version
+			 *
+			 * @return $this
+			 */
+			public function set_min_wp_require( $version ) {
+				$this->min_wp_version = $version;
+				
+				return $this;
+			}
+			
+			/**
+			 * @param string $version
+			 *
+			 * @return $this
+			 */
+			public function set_min_wc_require( $version ) {
+				$this->min_wc_version = $version;
+				
+				return $this;
+			}
+			
+			/**
+			 * @param $version
+			 *
+			 * @return $this
+			 */
+			public function set_min_openssl_require( $version ) {
+				$this->min_openssl_version = $version;
+				
+				return $this;
+			}
+			
+			/**
+			 * @param string $plugin_name Name in wp format dir/file.php
+			 * @param string $nice_plugin_name Nice plugin name for better looks in notice
+			 * @param string $plugin_require_version required plugin minimum version
+			 *
+			 * @return $this
+			 */
+			public function add_plugin_require( $plugin_name, $nice_plugin_name = null, $plugin_require_version = null ) {
+				$this->plugin_require[ $plugin_name ] = array(
+					self::PLUGIN_INFO_KEY_NAME      => $plugin_name,
+					self::PLUGIN_INFO_KEY_NICE_NAME => $nice_plugin_name === null ? $plugin_name : $nice_plugin_name,
+					self::PLUGIN_INFO_VERSION       => $plugin_require_version === null ?
+						self::PLUGIN_INFO_FAKE_REQUIRED_MINIMUM_VERSION : $plugin_require_version,
+				);
+				
+				return $this;
+			}
+			
+			/**
+			 * Add plugin to require list. Plugin is from repository so we can ask for installation.
+			 *
+			 * @param string $plugin_name Name in wp format dir/file.php
+			 * @param string $version Required version of the plugin.
+			 * @param string $nice_plugin_name Nice plugin name for better looks in notice
+			 *
+			 * @return $this
+			 */
+			public function add_plugin_repository_require( $plugin_name, $version, $nice_plugin_name = null ) {
+				$this->plugin_require[ $plugin_name ] = array(
+					self::PLUGIN_INFO_KEY_NAME      => $plugin_name,
+					self::PLUGIN_INFO_VERSION       => $version,
+					'repository_url'                => 'http://downloads.wordpress.org/plugin/' . dirname( $plugin_name ) . '.latest-stable.zip',
+					self::PLUGIN_INFO_KEY_NICE_NAME => $nice_plugin_name === null ? $plugin_name : $nice_plugin_name
+				);
+				
+				return $this;
+			}
+			
+			/**
+			 * @param string $module_name
+			 * @param string $nice_name Nice module name for better looks in notice
+			 *
+			 * @return $this
+			 */
+			public function add_php_module_require( $module_name, $nice_name = null ) {
+				if ( $nice_name === null ) {
+					$this->module_require[ $module_name ] = $module_name;
+				} else {
+					$this->module_require[ $module_name ] = $nice_name;
+				}
+				
+				return $this;
+			}
+			
+			/**
+			 * @param string $setting
+			 * @param mixed $value
+			 *
+			 * @return $this
+			 */
+			public function add_php_setting_require( $setting, $value ) {
+				$this->setting_require[ $setting ] = $value;
+				
+				return $this;
+			}
+			
+			/**
+			 * Returns true if are requirements are met.
+			 *
+			 * @return bool
+			 */
+			public function are_requirements_met() {
+				$this->notices = $this->prepare_requirement_notices();
+				
+				return count( $this->notices ) === 0;
+			}
+			
+			/**
+			 * @return array
+			 */
+			private function prepare_requirement_notices() {
+				$notices = array();
+				if ( ! self::is_php_at_least( $this->min_php_version ) ) {
+					$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run on PHP versions older than %s. Please contact your host and ask them to upgrade.',
+						$this->get_text_domain() ), esc_html( $this->plugin_name ), $this->min_php_version ) );
+				}
+				if ( ! self::is_wp_at_least( $this->min_wp_version ) ) {
+					$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run on WordPress versions older than %s. Please update WordPress.',
+						$this->get_text_domain() ), esc_html( $this->plugin_name ), $this->min_wp_version ) );
+				}
+				if ( $this->min_wc_version !== null && $this->can_check_plugin_version() && ! self::is_wc_at_least( $this->min_wc_version ) ) {
+					$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run on WooCommerce versions older than %s. Please update WooCommerce.',
+						$this->get_text_domain() ), esc_html( $this->plugin_name ), $this->min_wc_version ) );
+				}
+				if ( $this->min_openssl_version !== null && ! self::is_open_ssl_at_least( $this->min_openssl_version ) ) {
+					$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without OpenSSL module version at least %s. Please update OpenSSL module.',
+						$this->get_text_domain() ), esc_html( $this->plugin_name ),
+						'0x' . dechex( $this->min_openssl_version ) ) );
+				}
+				
+				$notices = $this->append_plugin_require_notices( $notices );
+				$notices = $this->append_module_require_notices( $notices );
+				$notices = $this->append_settings_require_notices( $notices );
+				$notices = $this->check_minimum_require_plugins_version_and_append_notices( $notices );
+				
+				return $notices;
+			}
+			
+			/**
+			 * @param $min_version
+			 *
+			 * @return mixed
+			 */
+			public static function is_php_at_least( $min_version ) {
+				return version_compare( PHP_VERSION, $min_version, '>=' );
+			}
+			
+			/**
+			 * Prepares message in html format
+			 *
+			 * @param string $message
+			 *
+			 * @return string
+			 */
+			protected function prepare_notice_message( $message ) {
+				return '<div class="error"><p>' . $message . '</p></div>';
+			}
+			
+			public function get_text_domain() {
+				return $this->text_domain;
+			}
+			
+			/**
+			 * @param string $min_version
+			 *
+			 * @return bool
+			 */
+			public static function is_wp_at_least( $min_version ) {
+				return version_compare( get_bloginfo( 'version' ), $min_version, '>=' );
+			}
+			
+			/**
+			 * Are plugins loaded so we can check the version
+			 *
+			 * @return bool
+			 */
+			private function can_check_plugin_version() {
+				return did_action( 'plugins_loaded' ) > 0;
+			}
+			
+			/**
+			 * Checks if plugin is active and have designated version. Needs to be enabled in deferred way.
+			 *
+			 * @param string $min_version
+			 *
+			 * @return bool
+			 */
+			public static function is_wc_at_least( $min_version ) {
+				return defined( 'WC_VERSION' ) &&
+				       version_compare( WC_VERSION, $min_version, '>=' );
+			}
+			
+			/**
+			 * Checks if ssl version is valid
+			 *
+			 * @param int $required_version Version in hex. Version 9.6 is 0x000906000
+			 *
+			 * @return bool
+			 * @see https://www.openssl.org/docs/man1.1.0/crypto/OPENSSL_VERSION_NUMBER.html
+			 *
+			 */
+			public static function is_open_ssl_at_least( $required_version ) {
+				return defined( 'OPENSSL_VERSION_NUMBER' ) && OPENSSL_VERSION_NUMBER > (int) $required_version;
+			}
+			
+			/**
+			 * @param $notices array
+			 *
+			 * @return array
+			 */
+			private function check_minimum_require_plugins_version_and_append_notices( $notices ) {
+				$required_plugins = $this->retrieve_required_plugins_data();
+				if ( count( $required_plugins ) > 0 ) {
+					foreach ( $required_plugins as $plugin ) {
+						if ( version_compare ( $plugin[ 'Version' ], $plugin[ self::PLUGIN_INFO_APPEND_PLUGIN_DATA ] , '<' ) ) {
+							$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin requires at least %s version of %s to work correctly. Please update it', $this->get_text_domain() ),
+								esc_html( $this->plugin_name ), $plugin[ self::PLUGIN_INFO_APPEND_PLUGIN_DATA ], $plugin[ 'Version' ] ) );
+						}
 					}
-
-					if ( $notice !== null ) {
-						$notices[] = $notice;
+				}
+				
+				return $notices;
+			}
+			
+			/**
+			 * Check the plugins directory and retrieve all plugin files with plugin data.
+			 *
+			 * @return array In format [ 'plugindir/pluginfile.php' => ['Name' => 'Plugin Name', 'Version' => '1.0.1', ...],  ]
+			 */
+			private static function retrieve_plugins_data_in_transient() {
+				
+				$plugins = get_transient( self::PLUGIN_INFO_TRANSIENT_NAME );
+				
+				if ( $plugins === false ) {
+					if ( ! function_exists( 'get_plugins' ) ) {
+						require_once ABSPATH . '/wp-admin/includes/plugin.php';
 					}
+					
+					$plugins = function_exists( 'get_plugins' ) ? get_plugins() : array();
+					set_transient( self::PLUGIN_INFO_TRANSIENT_NAME, $plugins, self::PLUGIN_INFO_TRANSIENT_EXPIRATION_TIME );
 				}
+				
+				return $plugins;
 			}
-
-			return $notices;
-		}
-
-		/**
-		 * Prepares WP install url and injects info about plugin to the WP update engine.
-		 *
-		 * @param array $plugin_info
-		 *
-		 * @return string
-		 */
-		private function prepare_plugin_repository_install_url( $plugin_info ) {
-			$slug = basename( $plugin_info[ self::PLUGIN_INFO_KEY_NAME ] );
-			$install_url = self_admin_url( 'update.php?action=install-plugin&plugin=' . $slug );
-			if ( function_exists( 'wp_nonce_url' ) && function_exists( 'wp_create_nonce' ) ) {
-				$install_url = wp_nonce_url( $install_url, 'install-plugin_' . $slug );
-			}
-			add_filter( 'plugins_api', function ( $api, $action, $args ) use ( $plugin_info, $slug ) {
-				if ( 'plugin_information' !== $action ||
-				     false !== $api ||
-				     ! isset( $args->slug ) ||
-				     $slug !== $args->slug
-				) {
-					return $api;
+			
+			/**
+			 * Check the plugins directory and retrieve all required plugin files with plugin data.
+			 *
+			 * @return array In format [ 'plugindir/pluginfile.php' => ['Name' => 'Plugin Name', 'Version' => '1.0.1', 'required_version' => '1.0.2']...  ]
+			 */
+			private function retrieve_required_plugins_data() {
+				
+				$require_plugins = array();
+				$plugins = self::retrieve_plugins_data_in_transient();
+				if ( is_array( $plugins ) ) {
+					if ( count( $plugins ) > 0 ) {
+						if ( ! empty( $this->plugin_require ) ) {
+							foreach ( $this->plugin_require as $plugin ) {
+								$plugin_file_name = $plugin[ self::PLUGIN_INFO_KEY_NAME ];
+								$plugin_version = $plugin[ self::PLUGIN_INFO_VERSION ];
+								
+								if ( self::is_wp_plugin_active( $plugin_file_name ) ) {
+									$require_plugins[ $plugin_file_name ] = $plugins[ $plugin_file_name ];
+									$require_plugins[ $plugin_file_name ][ self::PLUGIN_INFO_APPEND_PLUGIN_DATA ] = $plugin_version;
+								}
+							}
+						}
+					}
 				}
-
-				$api                = new stdClass();
-				$api->name          = $plugin_info['nice_name']; // self in closures requires 5.4
-				$api->version       = $plugin_info['version']; // self in closures requires 5.4
-				$api->download_link = esc_url( $plugin_info['repository_url'] ); // self in closures requires 5.4
-
-				return $api;
-			}, 10, 3 );
-
-			return $install_url;
-		}
-
-		/**
-		 * @param array $plugin_info Internal required plugin info data.
-		 *
-		 * @return string|null Return null if no notice is needed.
-		 */
-		private function prepare_plugin_repository_require_notice( $plugin_info ) {
-			$name      = $plugin_info[ self::PLUGIN_INFO_KEY_NAME ];
-			$nice_name = $plugin_info[ self::PLUGIN_INFO_KEY_NICE_NAME ];
-
-			if ( ! self::is_wp_plugin_active( $name ) ) {
-				if ( ! self::is_wp_plugin_installed( $name ) ) {
-					$install_url = $this->prepare_plugin_repository_install_url( $plugin_info );
-
-					return $this->prepare_notice_message( sprintf( wp_kses( __( 'The &#8220;%s&#8221; plugin requires free %s plugin. <a href="%s">Install %s →</a>',
+				
+				return $require_plugins;
+			}
+			
+			/**
+			 * @param array $notices
+			 *
+			 * @return array
+			 */
+			private function append_plugin_require_notices( $notices ) {
+				if ( count( $this->plugin_require ) > 0 ) {
+					foreach ( $this->plugin_require as $plugin_name => $plugin_info ) {
+						$notice = null;
+						if ( isset( $plugin_info['repository_url'] ) ) {
+							$notice = $this->prepare_plugin_repository_require_notice( $plugin_info );
+						} elseif ( ! self::is_wp_plugin_active( $plugin_name ) ) {
+							$notice = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without %s active. Please install and activate %s plugin.',
+								$this->get_text_domain() ), esc_html( $this->plugin_name ),
+								esc_html( basename( $plugin_info[ self::PLUGIN_INFO_KEY_NICE_NAME ] ) ),
+								esc_html( basename( $plugin_info[ self::PLUGIN_INFO_KEY_NICE_NAME ] ) ) ) );
+						}
+						
+						if ( $notice !== null ) {
+							$notices[] = $notice;
+						}
+					}
+				}
+				
+				return $notices;
+			}
+			
+			/**
+			 * Prepares WP install url and injects info about plugin to the WP update engine.
+			 *
+			 * @param array $plugin_info
+			 *
+			 * @return string
+			 */
+			private function prepare_plugin_repository_install_url( $plugin_info ) {
+				$slug        = basename( $plugin_info[ self::PLUGIN_INFO_KEY_NAME ] );
+				$install_url = self_admin_url( 'update.php?action=install-plugin&plugin=' . $slug );
+				if ( function_exists( 'wp_nonce_url' ) && function_exists( 'wp_create_nonce' ) ) {
+					$install_url = wp_nonce_url( $install_url, 'install-plugin_' . $slug );
+				}
+				add_filter( 'plugins_api', function ( $api, $action, $args ) use ( $plugin_info, $slug ) {
+					if ( 'plugin_information' !== $action ||
+					     false !== $api ||
+					     ! isset( $args->slug ) ||
+					     $slug !== $args->slug
+					) {
+						return $api;
+					}
+					
+					$api                = new stdClass();
+					$api->name          = $plugin_info['nice_name']; // self in closures requires 5.4
+					$api->version       = $plugin_info['version']; // self in closures requires 5.4
+					$api->download_link = esc_url( $plugin_info['repository_url'] ); // self in closures requires 5.4
+					
+					return $api;
+				}, 10, 3 );
+				
+				return $install_url;
+			}
+			
+			/**
+			 * @param array $plugin_info Internal required plugin info data.
+			 *
+			 * @return string|null Return null if no notice is needed.
+			 */
+			private function prepare_plugin_repository_require_notice( $plugin_info ) {
+				$name      = $plugin_info[ self::PLUGIN_INFO_KEY_NAME ];
+				$nice_name = $plugin_info[ self::PLUGIN_INFO_KEY_NICE_NAME ];
+				
+				if ( ! self::is_wp_plugin_active( $name ) ) {
+					if ( ! self::is_wp_plugin_installed( $name ) ) {
+						$install_url = $this->prepare_plugin_repository_install_url( $plugin_info );
+						
+						return $this->prepare_notice_message( sprintf( wp_kses( __( 'The &#8220;%s&#8221; plugin requires free %s plugin. <a href="%s">Install %s →</a>',
+							$this->get_text_domain() ), array( 'a' => array( 'href' => array() ) ) ),
+							$this->plugin_name, $nice_name, esc_url( $install_url ), $nice_name ) );
+					}
+					$activate_url = 'plugins.php?action=activate&plugin=' . urlencode( $plugin_info[ self::PLUGIN_INFO_KEY_NAME ] ) . '&plugin_status=all&paged=1&s';
+					if ( function_exists( 'wp_create_nonce' ) ) {
+						$activate_url .= '&_wpnonce=' . urlencode( wp_create_nonce( 'activate-plugin_' . $name ) );
+					}
+					
+					return $this->prepare_notice_message( sprintf( wp_kses( __( 'The &#8220;%s&#8221; plugin requires activating %s plugin. <a href="%s">Activate %s →</a>',
 						$this->get_text_domain() ), array( 'a' => array( 'href' => array() ) ) ),
-						$this->plugin_name, $nice_name, esc_url( $install_url ), $nice_name ) );
+						$this->plugin_name, $nice_name, esc_url( admin_url( $activate_url ) ), $nice_name ) );
 				}
-				$activate_url = 'plugins.php?action=activate&plugin=' . urlencode( $plugin_info[ self::PLUGIN_INFO_KEY_NAME ] ) . '&plugin_status=all&paged=1&s';
-				if ( function_exists( 'wp_create_nonce' ) ) {
-					$activate_url .= '&_wpnonce=' . urlencode( wp_create_nonce( 'activate-plugin_' . $name ) );
+				
+				return null;
+			}
+			
+			/**
+			 * Checks if plugin is active. Needs to be used in deferred way.
+			 *
+			 * @param string $plugin_file
+			 *
+			 * @return bool
+			 */
+			public static function is_wp_plugin_active( $plugin_file ) {
+				$active_plugins = (array) get_option( 'active_plugins', array() );
+				
+				if ( is_multisite() ) {
+					$active_plugins = array_merge( $active_plugins, get_site_option( 'active_sitewide_plugins', array() ) );
 				}
-
-				return $this->prepare_notice_message( sprintf( wp_kses( __( 'The &#8220;%s&#8221; plugin requires activating %s plugin. <a href="%s">Activate %s →</a>',
-					$this->get_text_domain() ), array( 'a' => array( 'href' => array() ) ) ),
-					$this->plugin_name, $nice_name, esc_url( admin_url( $activate_url ) ), $nice_name ) );
+				
+				return in_array( $plugin_file, $active_plugins ) || array_key_exists( $plugin_file, $active_plugins );
 			}
-
-			return null;
-		}
-
-		/**
-		 * Checks if plugin is active. Needs to be used in deferred way.
-		 *
-		 * @param string $plugin_file
-		 *
-		 * @return bool
-		 */
-		public static function is_wp_plugin_active( $plugin_file ) {
-			$active_plugins = (array) get_option( 'active_plugins', array() );
-
-			if ( is_multisite() ) {
-				$active_plugins = array_merge( $active_plugins, get_site_option( 'active_sitewide_plugins', array() ) );
-			}
-
-			return in_array( $plugin_file, $active_plugins ) || array_key_exists( $plugin_file, $active_plugins );
-		}
-
-		/**
-		 * Checks if plugin is installed. Needs to be enabled in deferred way.
-		 *
-		 * @param string $plugin_file
-		 *
-		 * @return bool
-		 */
-		public static function is_wp_plugin_installed( $plugin_file ) {
-			if ( ! function_exists( 'get_plugins' ) ) {
-				require_once ABSPATH . '/wp-admin/includes/plugin.php';
+			
+			/**
+			 * Checks if plugin is installed. Needs to be enabled in deferred way.
+			 *
+			 * @param string $plugin_file
+			 *
+			 * @return bool
+			 */
+			public static function is_wp_plugin_installed( $plugin_file ) {
+				$plugins_data = self::retrieve_plugins_data_in_transient();
+				
+				return array_key_exists( $plugin_file, (array)$plugins_data );
 			}
-
-			return array_key_exists( $plugin_file, get_plugins() );
-		}
-
-		/**
-		 * @param array $notices
-		 *
-		 * @return array
-		 */
-		private function append_module_require_notices( $notices ) {
-			if ( count( $this->module_require ) > 0 ) {
-				foreach ( $this->module_require as $module_name => $nice_module_name ) {
-					if ( ! self::is_module_active( $module_name ) ) {
-						$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without %s php module installed. Please contact your host and ask them to install %s.',
-							$this->get_text_domain() ), esc_html( $this->plugin_name ),
-							esc_html( basename( $nice_module_name ) ), esc_html( basename( $nice_module_name ) ) ) );
+			
+			/**
+			 * @param array $notices
+			 *
+			 * @return array
+			 */
+			private function append_module_require_notices( $notices ) {
+				if ( count( $this->module_require ) > 0 ) {
+					foreach ( $this->module_require as $module_name => $nice_module_name ) {
+						if ( ! self::is_module_active( $module_name ) ) {
+							$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without %s php module installed. Please contact your host and ask them to install %s.',
+								$this->get_text_domain() ), esc_html( $this->plugin_name ),
+								esc_html( basename( $nice_module_name ) ), esc_html( basename( $nice_module_name ) ) ) );
+						}
 					}
 				}
+				
+				return $notices;
 			}
-
-			return $notices;
-		}
-
-		/**
-		 * @param string $name
-		 *
-		 * @return bool
-		 */
-		public static function is_module_active( $name ) {
-			return extension_loaded( $name );
-		}
-
-		/**
-		 * @param array $notices
-		 *
-		 * @return array
-		 */
-		private function append_settings_require_notices( $notices ) {
-			if ( count( $this->setting_require ) > 0 ) {
-				foreach ( $this->setting_require as $setting => $value ) {
-					if ( ! self::is_setting_set( $setting, $value ) ) {
-						$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without %s php setting set to %s. Please contact your host and ask them to set %s.',
-							$this->get_text_domain() ), esc_html( $this->plugin_name ),
-							esc_html( basename( $setting ) ),
-							esc_html( basename( $value ) ), esc_html( basename( $setting ) ) ) );
+			
+			/**
+			 * @param string $name
+			 *
+			 * @return bool
+			 */
+			public static function is_module_active( $name ) {
+				return extension_loaded( $name );
+			}
+			
+			/**
+			 * @param array $notices
+			 *
+			 * @return array
+			 */
+			private function append_settings_require_notices( $notices ) {
+				if ( count( $this->setting_require ) > 0 ) {
+					foreach ( $this->setting_require as $setting => $value ) {
+						if ( ! self::is_setting_set( $setting, $value ) ) {
+							$notices[] = $this->prepare_notice_message( sprintf( __( 'The &#8220;%s&#8221; plugin cannot run without %s php setting set to %s. Please contact your host and ask them to set %s.',
+								$this->get_text_domain() ), esc_html( $this->plugin_name ),
+								esc_html( basename( $setting ) ),
+								esc_html( basename( $value ) ), esc_html( basename( $setting ) ) ) );
+						}
 					}
 				}
+				
+				return $notices;
 			}
-
-			return $notices;
-		}
-
-		/**
-		 * @param string $name
-		 * @param mixed $value
-		 *
-		 * @return bool
-		 */
-		public static function is_setting_set( $name, $value ) {
-			return ini_get( $name ) === (string) $value;
-		}
-
-		/**
-		 * @return void
-		 *
-		 * @deprecated use render_notices or disable_plugin
-		 */
-		public function disable_plugin_render_notice() {
-			add_action( self::HOOK_ADMIN_NOTICES_ACTION, array( $this, 'handle_render_notices_action' ) );
-		}
-
-		/**
-		 * Renders requirement notices in admin panel
-		 *
-		 * @return void
-		 */
-		public function render_notices() {
-			add_action( self::HOOK_ADMIN_NOTICES_ACTION, array( $this, 'handle_render_notices_action' ) );
-		}
-
-		/**
-		 * Renders requirement notices in admin panel
-		 *
-		 * @return void
-		 */
-		public function disable_plugin() {
-			add_action( self::HOOK_ADMIN_NOTICES_ACTION, array( $this, 'handle_deactivate_action' ) );
-		}
-
-		/**
-		 * @return void
-		 * @internal Do not use as public. Public only for wp action.
-		 *
-		 */
-		public function handle_deactivate_action() {
-			if ( isset( $this->plugin_file ) ) {
-				deactivate_plugins( plugin_basename( $this->plugin_file ) );
+			
+			/**
+			 * @param string $name
+			 * @param mixed $value
+			 *
+			 * @return bool
+			 */
+			public static function is_setting_set( $name, $value ) {
+				return ini_get( $name ) === (string) $value;
 			}
-		}
-
-		/**
-		 * Should be called as WordPress action
-		 *
-		 * @return void
-		 * @internal Do not use as public. Public only for wp action.
-		 *
-		 */
-		public function handle_render_notices_action() {
-			foreach ( $this->notices as $notice ) {
-				echo $notice;
+			
+			/**
+			 * @return void
+			 *
+			 * @deprecated use render_notices or disable_plugin
+			 */
+			public function disable_plugin_render_notice() {
+				add_action( self::HOOK_ADMIN_NOTICES_ACTION, array( $this, 'handle_render_notices_action' ) );
+			}
+			
+			/**
+			 * Renders requirement notices in admin panel
+			 *
+			 * @return void
+			 */
+			public function render_notices() {
+				add_action( self::HOOK_ADMIN_NOTICES_ACTION, array( $this, 'handle_render_notices_action' ) );
+			}
+			
+			/**
+			 * Renders requirement notices in admin panel
+			 *
+			 * @return void
+			 */
+			public function disable_plugin() {
+				add_action( self::HOOK_ADMIN_NOTICES_ACTION, array( $this, 'handle_deactivate_action' ) );
+			}
+			
+			/**
+			 * @return void
+			 * @internal Do not use as public. Public only for wp action.
+			 *
+			 */
+			public function handle_deactivate_action() {
+				if ( isset( $this->plugin_file ) ) {
+					deactivate_plugins( plugin_basename( $this->plugin_file ) );
+					
+					delete_transient( self::PLUGIN_INFO_TRANSIENT_NAME );
+				}
+			}
+			
+			/**
+			 * Triggers the transient delete after plugin deactivated
+			 *
+			 *@return void
+			 */
+			public function transient_delete_on_plugin_version_changed() {
+				add_action( self::HOOK_PLUGIN_DEACTIVATED_ACTION, array( $this, 'handle_transient_delete_action' ) );
+				add_action( self::HOOK_PLUGIN_ACTIVATED_ACTION,  array( $this,'handle_transient_delete_action' ) );
+			}
+			
+			/**
+			 * Handles the transient delete
+			 *
+			 * @return void
+			 */
+			public function handle_transient_delete_action() {
+				delete_transient(self::PLUGIN_INFO_TRANSIENT_NAME );
+			}
+			
+			/**
+			 * Should be called as WordPress action
+			 *
+			 * @return void
+			 * @internal Do not use as public. Public only for wp action.
+			 *
+			 */
+			public function handle_render_notices_action() {
+				foreach ( $this->notices as $notice ) {
+					echo $notice;
+				}
 			}
 		}
-	}
-}
\ No newline at end of file
+	}
\ No newline at end of file
diff --git a/src/Basic_Requirement_Checker_Factory.php b/src/Basic_Requirement_Checker_Factory.php
index 5bc7cfdc692a8e38c5863484033ef5d964f6379a..6098eaac11a81412848b84e4a4acb876a0ca235d 100644
--- a/src/Basic_Requirement_Checker_Factory.php
+++ b/src/Basic_Requirement_Checker_Factory.php
@@ -1,70 +1,73 @@
 <?php
-
-if ( ! class_exists( 'Basic_Requirement_Checker' ) ) {
-	require_once 'Basic_Requirement_Checker.php';
-}
-
-if ( ! class_exists( 'WPDesk_Basic_Requirement_Checker_With_Update_Disable' ) ) {
-	require_once 'Basic_Requirement_Checker_With_Update_Disable.php';
-}
-
-/**
- * Falicitates createion of requirement checker
- */
-class WPDesk_Basic_Requirement_Checker_Factory {
-	const LIBRARY_TEXT_DOMAIN = 'wp-basic-requirements';
-
-	/**
-	 * Creates a simplest possible version of requirement checker.
-	 *
-	 * @param string $plugin_file
-	 * @param string $plugin_name
-	 * @param string|null $text_domain Text domain to use. If null try to use library text domain.
-	 *
-	 * @return WPDesk_Requirement_Checker
-	 */
-	public function create_requirement_checker( $plugin_file, $plugin_name, $text_domain = null ) {
-		return new WPDesk_Basic_Requirement_Checker( $plugin_file, $plugin_name, $text_domain, null, null );
+	
+	if ( ! class_exists( 'Basic_Requirement_Checker' ) ) {
+		require_once 'Basic_Requirement_Checker.php';
 	}
-
+	
+	if ( ! class_exists( 'WPDesk_Basic_Requirement_Checker_With_Update_Disable' ) ) {
+		require_once 'Basic_Requirement_Checker_With_Update_Disable.php';
+	}
+	
 	/**
-	 * Creates a requirement checker according to given requirements array info.
-	 *
-	 * @param string $plugin_file
-	 * @param string $plugin_name
-	 * @param string $text_domain Text domain to use. If null try to use library text domain.
-	 * @param array $requirements Requirements array as given by plugin.
-	 *
-	 * @return WPDesk_Requirement_Checker
+	 * Falicitates createion of requirement checker
 	 */
-	public function create_from_requirement_array( $plugin_file, $plugin_name, $requirements, $text_domain = null ) {
-		$requirements_checker = new WPDesk_Basic_Requirement_Checker_With_Update_Disable(
-			$plugin_file,
-			$plugin_name,
-			$text_domain,
-			$requirements['php'],
-			$requirements['wp']
-		);
-
-		if ( isset( $requirements['plugins'] ) ) {
-			foreach ( $requirements['plugins'] as $requirement ) {
-				$requirements_checker->add_plugin_require( $requirement['name'], $requirement['nice_name'] );
-			}
+	class WPDesk_Basic_Requirement_Checker_Factory {
+		const LIBRARY_TEXT_DOMAIN = 'wp-basic-requirements';
+		
+		/**
+		 * Creates a simplest possible version of requirement checker.
+		 *
+		 * @param string $plugin_file
+		 * @param string $plugin_name
+		 * @param string|null $text_domain Text domain to use. If null try to use library text domain.
+		 *
+		 * @return WPDesk_Requirement_Checker
+		 */
+		public function create_requirement_checker( $plugin_file, $plugin_name, $text_domain = null ) {
+			return new WPDesk_Basic_Requirement_Checker( $plugin_file, $plugin_name,
+				$this->initialize_translations( $text_domain ), null, null );
 		}
-
-		if ( isset( $requirements['repo_plugins'] ) ) {
-			foreach ( $requirements['repo_plugins'] as $requirement ) {
-				$requirements_checker->add_plugin_repository_require( $requirement['name'], $requirement['version'],
-					$requirement['nice_name'] );
+		
+		/**
+		 * Creates a requirement checker according to given requirements array info.
+		 *
+		 * @param string $plugin_file
+		 * @param string $plugin_name
+		 * @param string $text_domain Text domain to use. If null try to use library text domain.
+		 * @param array $requirements Requirements array as given by plugin.
+		 *
+		 * @return WPDesk_Requirement_Checker
+		 */
+		public function create_from_requirement_array( $plugin_file, $plugin_name, $requirements, $text_domain = null ) {
+			$requirements_checker = new WPDesk_Basic_Requirement_Checker_With_Update_Disable(
+				$plugin_file,
+				$plugin_name,
+				 $text_domain,
+				$requirements['php'],
+				$requirements['wp']
+			);
+			
+			if ( isset( $requirements['plugins'] ) ) {
+				foreach ( $requirements['plugins'] as $requirement ) {
+					$requirements_checker->add_plugin_require( $requirement['name'], $requirement['nice_name'], $requirement['version'] );
+				}
+				
+				$requirements_checker->transient_delete_on_plugin_version_changed();
 			}
-		}
-
-		if ( isset( $requirements['modules'] ) ) {
-			foreach ( $requirements['modules'] as $requirement ) {
-				$requirements_checker->add_php_module_require( $requirement['name'], $requirement['nice_name'] );
+			
+			if ( isset( $requirements['repo_plugins'] ) ) {
+				foreach ( $requirements['repo_plugins'] as $requirement ) {
+					$requirements_checker->add_plugin_repository_require( $requirement['name'], $requirement['version'],
+						$requirement['nice_name'] );
+				}
+			}
+			
+			if ( isset( $requirements['modules'] ) ) {
+				foreach ( $requirements['modules'] as $requirement ) {
+					$requirements_checker->add_php_module_require( $requirement['name'], $requirement['nice_name'] );
+				}
 			}
+			
+			return $requirements_checker;
 		}
-
-		return $requirements_checker;
-	}
-}
+	}
\ No newline at end of file
diff --git a/src/Requirement_Checker.php b/src/Requirement_Checker.php
index aa472cad4e5c02e9ad38aded009b296d1c370f87..033501926396359baa457b0b02229792a59077bd 100644
--- a/src/Requirement_Checker.php
+++ b/src/Requirement_Checker.php
@@ -1,81 +1,81 @@
 <?php
-/**
- * Checks requirements for plugin
- * have to be compatible with PHP 5.2.x
- */
-interface WPDesk_Requirement_Checker
-{
-    /**
-     * @param string $version
-     *
-     * @return $this
-     */
-    public function set_min_php_require($version);
-
-    /**
-     * @param string $version
-     *
-     * @return $this
-     */
-    public function set_min_wp_require($version);
-
-    /**
-     * @param string $version
-     *
-     * @return $this
-     */
-    public function set_min_wc_require($version);
-
-    /**
-     * @param $version
-     *
-     * @return $this
-     */
-    public function set_min_openssl_require($version);
-
-    /**
-     * @param string $plugin_name
-     * @param string $nice_plugin_name Nice plugin name for better looks in notice
-     *
-     * @return $this
-     */
-    public function add_plugin_require($plugin_name, $nice_plugin_name = null);
-
-    /**
-     * @param string $module_name
-     * @param string $nice_name Nice module name for better looks in notice
-     *
-     * @return $this
-     */
-    public function add_php_module_require($module_name, $nice_name = null);
-
-    /**
-     * @param string $setting
-     * @param mixed $value
-     *
-     * @return $this
-     */
-    public function add_php_setting_require($setting, $value);
-
-    /**
-     * @return bool
-     */
-    public function are_requirements_met();
-
-    /**
-     * @return void
-     */
-    public function disable_plugin_render_notice();
-
 	/**
-	 * @return void
+	 * Checks requirements for plugin
+	 * have to be compatible with PHP 5.2.x
 	 */
-	public function render_notices();
-
-    /**
-     * Renders requirement notices in admin panel
-     *
-     * @return void
-     */
-    public function disable_plugin();
-}
\ No newline at end of file
+	interface WPDesk_Requirement_Checker
+	{
+		/**
+		 * @param string $version
+		 *
+		 * @return $this
+		 */
+		public function set_min_php_require($version);
+		
+		/**
+		 * @param string $version
+		 *
+		 * @return $this
+		 */
+		public function set_min_wp_require($version);
+		
+		/**
+		 * @param string $version
+		 *
+		 * @return $this
+		 */
+		public function set_min_wc_require($version);
+		
+		/**
+		 * @param $version
+		 *
+		 * @return $this
+		 */
+		public function set_min_openssl_require($version);
+		
+		/**
+		 * @param string $plugin_name
+		 * @param string $nice_plugin_name Nice plugin name for better looks in notice
+		 *
+		 * @return $this
+		 */
+		public function add_plugin_require($plugin_name, $nice_plugin_name = null);
+		
+		/**
+		 * @param string $module_name
+		 * @param string $nice_name Nice module name for better looks in notice
+		 *
+		 * @return $this
+		 */
+		public function add_php_module_require($module_name, $nice_name = null);
+		
+		/**
+		 * @param string $setting
+		 * @param mixed $value
+		 *
+		 * @return $this
+		 */
+		public function add_php_setting_require($setting, $value);
+		
+		/**
+		 * @return bool
+		 */
+		public function are_requirements_met();
+		
+		/**
+		 * @return void
+		 */
+		public function disable_plugin_render_notice();
+		
+		/**
+		 * @return void
+		 */
+		public function render_notices();
+		
+		/**
+		 * Renders requirement notices in admin panel
+		 *
+		 * @return void
+		 */
+		public function disable_plugin();
+	}
\ No newline at end of file
diff --git a/tests/unit/Test_Basic_Requirement_Checker.php b/tests/unit/Test_Basic_Requirement_Checker.php
index 552b31fbbff8e58fc1d9ee8a26eb7f8fe3912e69..5d986ef304a56b0695c6c8f27c4cf12f28f1400e 100644
--- a/tests/unit/Test_Basic_Requirement_Checker.php
+++ b/tests/unit/Test_Basic_Requirement_Checker.php
@@ -1,207 +1,224 @@
 <?php
-
-class Test_Basic_Requirement_Checker extends PHPUnit\Framework\TestCase {
-	const RANDOM_PLUGIN_FILE = 'file';
-
-	const RANDOM_PLUGIN_NAME = 'name';
-
-	const RANDOM_PLUGIN_TEXTDOMAIN = 'text';
-
-	const ALWAYS_VALID_PHP_VERSION = '5.2';
-
-	const ALWAYS_NOT_VALID_PHP_VERSION = '100.100';
-
-	const ALWAYS_VALID_WP_VERSION = '4.0';
-
-	const HOOK_TYPE_ACTION = 'action';
-
-	public function setUp() {
-		WP_Mock::setUp();
-
-		WP_Mock::wpFunction( 'get_bloginfo' )
-		       ->andReturn( self::ALWAYS_VALID_WP_VERSION );
-	}
-
-	public function tearDown() {
-		WP_Mock::tearDown();
-	}
-
-	public function test_php_version_check() {
-		$known_PHP_versions = array( '7.3', '7.2', '7.1', '7.0', '5.6', '5.5', '5.4', '5.3', '5.2' );
-
-		$requirements = $this->create_requirements_for_php_wp(
-			self::ALWAYS_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		foreach ( $known_PHP_versions as $version ) {
-			$requirements->set_min_php_require( $version );
-			if ( version_compare( PHP_VERSION, $version, '>=' ) ) {
-				$this->assertTrue( $requirements->are_requirements_met(),
-					'Should be ok because WP is OK and PHP is OK' );
-			} else {
-				$this->assertFalse( $requirements->are_requirements_met(),
-					'Should fail because required PHP should be at least  ' . $version );
+	
+	class Test_Basic_Requirement_Checker extends PHPUnit\Framework\TestCase {
+		const RANDOM_PLUGIN_FILE = 'file';
+		
+		const RANDOM_PLUGIN_NAME = 'name';
+		
+		const RANDOM_PLUGIN_TEXTDOMAIN = 'text';
+		
+		const ALWAYS_VALID_PHP_VERSION = '5.2';
+		
+		const ALWAYS_NOT_VALID_PHP_VERSION = '100.100';
+		
+		const ALWAYS_VALID_WP_VERSION = '4.0';
+		
+		const HOOK_TYPE_ACTION = 'action';
+		
+		const ALWAYS_FUNCTION_EXISTS = 'function_exists';
+		
+		public function setUp() {
+			WP_Mock::setUp();
+			
+			WP_Mock::wpFunction( 'get_bloginfo' )
+			       ->andReturn( self::ALWAYS_VALID_WP_VERSION );
+			
+			WP_Mock::wpFunction( 'get_transient' )
+			       ->andReturn( self::ALWAYS_FUNCTION_EXISTS );
+			
+			WP_Mock::wpFunction('set_transient')
+					->andReturn( self::ALWAYS_FUNCTION_EXISTS );
+			
+			WP_Mock::wpFunction( 'delete_transient' )
+					->andReturn( self::ALWAYS_FUNCTION_EXISTS );
+		}
+		
+		public function tearDown() {
+			WP_Mock::tearDown();
+		}
+		
+		public function test_php_version_check() {
+			$known_PHP_versions = array( '7.3', '7.2', '7.1', '7.0', '5.6', '5.5', '5.4', '5.3', '5.2' );
+			
+			$requirements = $this->create_requirements_for_php_wp(
+				self::ALWAYS_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			foreach ( $known_PHP_versions as $version ) {
+				$requirements->set_min_php_require( $version );
+				if ( version_compare( PHP_VERSION, $version, '>=' ) ) {
+					$this->assertTrue( $requirements->are_requirements_met(),
+						'Should be ok because WP is OK and PHP is OK' );
+				} else {
+					$this->assertFalse( $requirements->are_requirements_met(),
+						'Should fail because required PHP should be at least  ' . $version );
+				}
 			}
+			$requirements->set_min_php_require( self::ALWAYS_NOT_VALID_PHP_VERSION );
+			$requirements->are_requirements_met();
+			$this->expectOutputRegex( "/PHP/" );
+			$requirements->handle_render_notices_action();
+		}
+		
+		/**
+		 * @param string $php
+		 * @param string $wp
+		 *
+		 * @return WPDesk_Basic_Requirement_Checker
+		 */
+		private function create_requirements_for_php_wp( $php, $wp ) {
+			return new WPDesk_Basic_Requirement_Checker( self::RANDOM_PLUGIN_FILE, self::RANDOM_PLUGIN_NAME,
+				self::RANDOM_PLUGIN_TEXTDOMAIN, $php, $wp );
+		}
+		
+		public function test_wp_version_check() {
+			$wp_version_fail = '4.1';
+			
+			$requirements = $this->create_requirements_for_php_wp(
+				self::ALWAYS_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			$this->assertTrue( $requirements->are_requirements_met(), 'Should be ok because WP is OK and PHP is OK' );
+			$requirements->set_min_wp_require( $wp_version_fail );
+			$this->assertFalse( $requirements->are_requirements_met(),
+				'Should fail because required WP should be at least ' . $wp_version_fail );
+			
+			$this->expectOutputRegex( "/WordPress/" );
+			$requirements->handle_render_notices_action();
+		}
+		
+		/**
+		 * @requires extension curl
+		 */
+		public function test_module_check() {
+			$requirements = $this->create_requirements_for_php_wp(
+				self::ALWAYS_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			$requirements->add_php_module_require( 'curl' );
+			$this->assertTrue( $requirements->are_requirements_met(), 'Curl should exists' );
+			
+			$this->expectOutputRegex( "/^$/" );
+			$requirements->handle_render_notices_action();
+		}
+		
+		public function test_plugin_check_with_multisite() {
+			$multisite                     = true;
+			$exising_plugin_name           = 'WooCommerce';
+			$exising_multisite_plugin_name = 'Multisite';
+			$not_existing_plugin_name      = 'Not exist';
+			
+			WP_Mock::wpFunction( 'get_option' )
+			       ->withArgs( array( 'active_plugins', array() ) )
+			       ->andReturn( array( $exising_plugin_name ) );
+			
+			WP_Mock::wpFunction( 'is_multisite' )
+			       ->andReturn( $multisite );
+			
+			WP_Mock::wpFunction( 'get_site_option' )
+			       ->withArgs( array( 'active_sitewide_plugins', array() ) )
+			       ->andReturn( array( $exising_multisite_plugin_name ) );
+			
+			
+			$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			$requirements->add_plugin_require( $exising_plugin_name );
+			$this->assertTrue( $requirements->are_requirements_met(), 'Plugin should exists' );
+			
+			$requirements->add_plugin_require( $exising_multisite_plugin_name );
+			$this->assertTrue( $requirements->are_requirements_met(), 'Multisite plugin should exists' );
+			
+			$requirements->add_plugin_require( $not_existing_plugin_name );
+			$this->assertFalse( $requirements->are_requirements_met(), 'Plugin should not exists' );
+			
+			$this->expectOutputRegex( "/$not_existing_plugin_name/" );
+			$requirements->handle_render_notices_action();
+		}
+		
+		/**
+		 * @requires extension openssl
+		 */
+		public function test_existing_openssl_requirement() {
+			$open_ssl_always_valid     = 1;
+			$open_ssl_always_not_valid = 0x900905000; // 9.9.6
+			
+			$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			$this->assertTrue( $requirements->is_open_ssl_at_least( $open_ssl_always_valid ),
+				'OpenSSL should have at least 0.1 version if exists' );
+			
+			$this->assertFalse( $requirements->is_open_ssl_at_least( $open_ssl_always_not_valid ),
+				'OpenSSL should fail for that high number' );
+			
+			$requirements->set_min_openssl_require( $open_ssl_always_not_valid );
+			
+			$this->assertFalse( $requirements->are_requirements_met(),
+				'Requirement OpenSSL should fail for that high number' );
+			
+			$this->expectOutputRegex( '/without OpenSSL module/' );
+			$requirements->handle_render_notices_action();
+		}
+		
+		public function test_deactivate_plugin_notice() {
+			$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_NOT_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			WP_Mock::expectActionAdded( WPDesk_Basic_Requirement_Checker::HOOK_ADMIN_NOTICES_ACTION,
+				array( $requirements, 'handle_render_notices_action' ) );
+			
+			$this->assertFalse( $requirements->are_requirements_met() );
+			$requirements->disable_plugin();
+			$requirements->render_notices();
+			
+			$this->expectOutputRegex( '/cannot run on PHP/' );
+			$requirements->handle_render_notices_action();
+		}
+		
+		public function test_add_plugin_repository_require_checks_for_activation_and_installs() {
+			$random_version                = "1.0";
+			$activated_plugin_name         = 'WooCommerce';
+			$not_activated_plugin_name     = "some_other";
+			$not_installed_plugin_name     = "not_installed";
+			$installed_plugin_names        = array( $activated_plugin_name, $not_activated_plugin_name );
+			
+			
+			WP_Mock::wpFunction( 'get_plugins' )
+			       ->andReturn( array_flip( $installed_plugin_names ) );
+			
+			WP_Mock::wpFunction( 'get_option' )
+			       ->withArgs( array( 'active_plugins', array() ) )
+			       ->andReturn( array( $activated_plugin_name ) );
+			
+			WP_Mock::passthruFunction( 'self_admin_url' );
+			WP_Mock::passthruFunction( 'wp_kses' );
+			WP_Mock::passthruFunction( 'wp_nonce_url' );
+			WP_Mock::passthruFunction( 'wp_create_nonce' );
+			WP_Mock::passthruFunction( 'admin_url' );
+			
+			$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_VALID_PHP_VERSION,
+				self::ALWAYS_VALID_WP_VERSION );
+			
+			$requirements->add_plugin_repository_require( $activated_plugin_name, $random_version );
+			$this->assertTrue( $requirements->are_requirements_met(), "Should be met for activated plugin" );
+			
+			$requirements->add_plugin_require( $activated_plugin_name, $random_version );
+			$this->assertTrue( $requirements->are_requirements_met(), 'Should be met for required plugins' );
+			
+			$requirements->add_plugin_repository_require( $not_activated_plugin_name, $random_version );
+			$this->assertFalse( $requirements->are_requirements_met(), "Should NOT be met for only installed plugin" );
+			
+			$requirements->add_plugin_require( $not_activated_plugin_name, $random_version );
+			$this->assertFalse( $requirements->are_requirements_met(), "Should NOT be met for only installed plugin" );
+			
+			$this->expectOutputRegex( "/Activate $not_activated_plugin_name/" );
+			$requirements->handle_render_notices_action();
+			
+			$requirements->add_plugin_repository_require( $not_installed_plugin_name, $random_version );
+			$this->expectOutputRegex( "/Install $not_installed_plugin_name/" );
+			$this->assertFalse( $requirements->are_requirements_met(),
+				"Should NOT be met - uninstalled and unactive plugins are required" );
+			$requirements->handle_render_notices_action();
 		}
-		$requirements->set_min_php_require( self::ALWAYS_NOT_VALID_PHP_VERSION );
-		$requirements->are_requirements_met();
-		$this->expectOutputRegex( "/PHP/" );
-		$requirements->handle_render_notices_action();
-	}
-
-	/**
-	 * @param string $php
-	 * @param string $wp
-	 *
-	 * @return WPDesk_Basic_Requirement_Checker
-	 */
-	private function create_requirements_for_php_wp( $php, $wp ) {
-		return new WPDesk_Basic_Requirement_Checker( self::RANDOM_PLUGIN_FILE, self::RANDOM_PLUGIN_NAME,
-			self::RANDOM_PLUGIN_TEXTDOMAIN, $php, $wp );
-	}
-
-	public function test_wp_version_check() {
-		$wp_version_fail = '4.1';
-
-		$requirements = $this->create_requirements_for_php_wp(
-			self::ALWAYS_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		$this->assertTrue( $requirements->are_requirements_met(), 'Should be ok because WP is OK and PHP is OK' );
-		$requirements->set_min_wp_require( $wp_version_fail );
-		$this->assertFalse( $requirements->are_requirements_met(),
-			'Should fail because required WP should be at least ' . $wp_version_fail );
-
-		$this->expectOutputRegex( "/WordPress/" );
-		$requirements->handle_render_notices_action();
-	}
-
-	/**
-	 * @requires extension curl
-	 */
-	public function test_module_check() {
-		$requirements = $this->create_requirements_for_php_wp(
-			self::ALWAYS_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		$requirements->add_php_module_require( 'curl' );
-		$this->assertTrue( $requirements->are_requirements_met(), 'Curl should exists' );
-
-		$this->expectOutputRegex( "/^$/" );
-		$requirements->handle_render_notices_action();
-	}
-
-	public function test_plugin_check_with_multisite() {
-		$multisite                     = true;
-		$exising_plugin_name           = 'WooCommerce';
-		$exising_multisite_plugin_name = 'Multisite';
-		$not_existing_plugin_name      = 'Not exist';
-
-		WP_Mock::wpFunction( 'get_option' )
-		       ->withArgs( array( 'active_plugins', array() ) )
-		       ->andReturn( array( $exising_plugin_name ) );
-
-		WP_Mock::wpFunction( 'is_multisite' )
-		       ->andReturn( $multisite );
-
-		WP_Mock::wpFunction( 'get_site_option' )
-		       ->withArgs( array( 'active_sitewide_plugins', array() ) )
-		       ->andReturn( array( $exising_multisite_plugin_name ) );
-
-
-		$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		$requirements->add_plugin_require( $exising_plugin_name );
-		$this->assertTrue( $requirements->are_requirements_met(), 'Plugin should exists' );
-
-		$requirements->add_plugin_require( $exising_multisite_plugin_name );
-		$this->assertTrue( $requirements->are_requirements_met(), 'Multisite plugin should exists' );
-
-		$requirements->add_plugin_require( $not_existing_plugin_name );
-		$this->assertFalse( $requirements->are_requirements_met(), 'Plugin should not exists' );
-
-		$this->expectOutputRegex( "/$not_existing_plugin_name/" );
-		$requirements->handle_render_notices_action();
-	}
-
-	/**
-	 * @requires extension openssl
-	 */
-	public function test_existing_openssl_requirement() {
-		$open_ssl_always_valid     = 1;
-		$open_ssl_always_not_valid = 0x900905000; // 9.9.6
-
-		$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		$this->assertTrue( $requirements->is_open_ssl_at_least( $open_ssl_always_valid ),
-			'OpenSSL should have at least 0.1 version if exists' );
-
-		$this->assertFalse( $requirements->is_open_ssl_at_least( $open_ssl_always_not_valid ),
-			'OpenSSL should fail for that high number' );
-
-		$requirements->set_min_openssl_require( $open_ssl_always_not_valid );
-
-		$this->assertFalse( $requirements->are_requirements_met(),
-			'Requirement OpenSSL should fail for that high number' );
-
-		$this->expectOutputRegex( '/without OpenSSL module/' );
-		$requirements->handle_render_notices_action();
-	}
-
-	public function test_deactivate_plugin_notice() {
-		$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_NOT_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		WP_Mock::expectActionAdded( WPDesk_Basic_Requirement_Checker::HOOK_ADMIN_NOTICES_ACTION,
-			array( $requirements, 'handle_render_notices_action' ) );
-
-		$this->assertFalse( $requirements->are_requirements_met() );
-		$requirements->disable_plugin();
-		$requirements->render_notices();
-
-		$this->expectOutputRegex( '/cannot run on PHP/' );
-		$requirements->handle_render_notices_action();
-	}
-
-	public function test_add_plugin_repository_require_checks_for_activation_and_installs() {
-		$random_version            = "1.0";
-		$activated_plugin_name     = 'WooCommerce';
-		$not_activated_plugin_name = "some_other";
-		$not_installed_plugin_name = "not_installed";
-		$installed_plugin_names    = array( $activated_plugin_name, $not_activated_plugin_name );
-
-
-		WP_Mock::wpFunction( 'get_plugins' )
-		       ->andReturn( array_flip( $installed_plugin_names ) );
-
-		WP_Mock::wpFunction( 'get_option' )
-		       ->withArgs( array( 'active_plugins', array() ) )
-		       ->andReturn( array( $activated_plugin_name ) );
-
-		WP_Mock::passthruFunction( 'self_admin_url' );
-		WP_Mock::passthruFunction( 'wp_kses' );
-		WP_Mock::passthruFunction( 'wp_nonce_url' );
-		WP_Mock::passthruFunction( 'wp_create_nonce' );
-		WP_Mock::passthruFunction( 'admin_url' );
-
-		$requirements = $this->create_requirements_for_php_wp( self::ALWAYS_VALID_PHP_VERSION,
-			self::ALWAYS_VALID_WP_VERSION );
-
-		$requirements->add_plugin_repository_require( $activated_plugin_name, $random_version );
-		$this->assertTrue( $requirements->are_requirements_met(), "Should be met for activated plugin" );
-
-		$requirements->add_plugin_repository_require( $not_activated_plugin_name, $random_version );
-		$this->assertFalse( $requirements->are_requirements_met(), "Should NOT be met for only installed plugin" );
-
-		$this->expectOutputRegex( "/Activate $not_activated_plugin_name/" );
-		$requirements->handle_render_notices_action();
-
-		$requirements->add_plugin_repository_require( $not_installed_plugin_name, $random_version );
-		$this->expectOutputRegex( "/Install $not_installed_plugin_name/" );
-		$this->assertFalse( $requirements->are_requirements_met(),
-			"Should NOT be met - uninstalled and unactive plugins are required" );
-		$requirements->handle_render_notices_action();
-	}
-}
+	}
\ No newline at end of file