I faced this problem the first time, when I bought Fences on JUL2018 - and still haven't got a working solution till today.
But yesterday I bought Groupy, just to be remembered, that I'm still unable to register/enter my valid serial number.
When I open Fences/Groupy (Windows 10 Pro 1804, 64bit), the registration app opens its window. I can click on everything (see gif attached/below), but only the "purchase key" works. All the other buttons do just... NOTHING!
Is there any other chance to enter the serials - I would be happy to finally use my two bought apps.
Thanks for any help in advance!