App does not work. Got no response from service.

I paid for this app, downloaded it, set up in my desktop as well. I can remote log in via web (not with the app. It does nothing at all). But then it just asks me to pay more for a subscription.
Cant get a refund either.
Dont waste your money.

Shamanistic1 about RDM+ Remote Desktop for Mac and Windows, v3.11