Fatal error: Uncaught Error: Class 'Magento\Downloadable\Controller\Download' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Controller/Download/LinkSample.php:21 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Controller/Download/LinkSample.php on line 21