Feature/wp nonce

src/Basic_Requirement_Checker.php

@@ -310,10 +310,13 @@ if ( ! class_exists( 'WPDesk_Basic_Requirement_Checker' ) ) {
 		 * @return string
 		 */
 		private function prepare_plugin_repository_install_url( $plugin_info ) {
-			$slug        = basename( $plugin_info[ self::PLUGIN_INFO_KEY_NAME ] );
-			$install_url = wp_nonce_url( self_admin_url( 'update.php?action=install-plugin&plugin=' . $slug ),
-				'install-plugin_' . $slug );
-
+			$slug = basename( $plugin_info[ self::PLUGIN_INFO_KEY_NAME ] );
+			if ( function_exists( 'wp_nonce_url' ) ) {
+				$install_url = wp_nonce_url( self_admin_url( 'update.php?action=install-plugin&plugin=' . $slug ),
+					'install-plugin_' . $slug );
+			} else {
+				$install_url = self_admin_url( 'update.php?action=install-plugin&plugin=' . $slug );
+			}
 			add_filter( 'plugins_api', function ( $api, $action, $args ) use ( $plugin_info, $slug ) {
 				if ( 'plugin_information' !== $action ||
 				     false !== $api ||