Upgrade to 501 issue the checkout page is not found, /webassist/plugins/shopping_cart/checkout.php?ExpressCheckout=1
I checked the folder on my local and is not there so I am wondering if the new version has a new file name, possibly checkout_form.php
/webassist/plugins/shopping_cart/checkout_form.php?ExpressCheckout=1
When I appended the file name as above I got this error
Fatal error: Uncaught Error: Class 'WA_Include' not found webassist/plugins/shopping_cart/checkout_form.php:31 Stack trace: #0 {main} thrown in /webassist/plugins/shopping_cart/checkout_form.php on line 31
I will append this ticket with site and FTP info