Has no advantages over free RDP clients, doesn’t support copy/paste. I want my money back

I can’t get it to work and can’t find any help. The support link above doesn’t work. They don’t even provide instructions on how to use it.

This app is terrible. I paid $15.00 for the app and now it completely usless. Even better, I cannot receive any sort of support from these people. I have emialed a number of times (which is the only way to communicate with them) but no response has come.