Fatal error: Uncaught Error: Class 'WP_Upgrader_Skin' not found in C:\xampp\htdocs\wp-content\plugins\members\vendor-prefixed\caseproof\growth-tools\src\Helper\AddonInstallSkin.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\members\vendor-prefixed\caseproof\growth-tools\src\Helper\AddonInstallSkin.php on line 8