A client of mine has a version 1.3.7 cart system which was set up for them some while ago by someone else. They have received notification that they need to upgrade the URLs for Protx payment method to Sage Pay.

If I go the admin pages Modules > Payment and select Protx Form, there is a Check for updates link, I am offered an upgrade. Before I choose Upgrade now I'd like to know what it is going to do and be prepared should anything go wrong.

I assume the upgrade is going to alter/add files in includes/modules/payment. Is this right?

I have a backup on my local machine of the includes folder from the server and if anything goes wrong I can copy the includes/modules/payment folder back again?

Thanks for your help