Hi,
Users are getting the “Cannot load upgrades_credits.” error message once they return to the site from paypal. We’re definitely receiving the payment and the user does receive the credits once they log back in to their account.
all the files are in the following places :
paypal.php – goes in / <– root directory
upgrades.php – goes in /wp-admin
0-upgrades-hook.php – goes in /wp-content/mu-plugins
upgrades-framework.php – goes in /wp-content/mu-plugins
upgrades-payment-module-paypal.php – goes in /wp-content/mu-plugins