Fatal error: Uncaught Error: Class 'WP_Upgrader_Skin' not found in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\wp-mail-smtp\src\Admin\PluginsInstallSkin.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\wp-mail-smtp\src\Admin\PluginsInstallSkin.php on line 11