if you don't have that settings file somewhere in your system, then you have a completely different issue. I'm going to assume it's there somewhere. See if these directions help locating it and making the necessary changes.

https://kb.msp360.com/standalone-backup/general/obsolete-storage-destinations

I'm sorry but that doesn't help. It references editing the enginesettings.list that I do not have.

Can someone please share it with me?

If not, then who would I go about getting a refund?

Can you try reinstalling? Try searching your system for that file and see if you can locate it in another folder. If you want a refund you'd have to reach out to the sales team. Go to the MSP360.com website, and click on the contact link.