Client doesn't open anymore after asking me to pay for the app

Hi,

A week ago I got a message I had to pay for the free license and had to use an earlier version. Not sure. I decided to deinstall and when I tried to install it didn’t start up again. I’m stuck . Won’t start up. Tried reinstalling nothing happened. Please help.

I managed to open it but get that this version is newer than your current license permits???