My original issue was after installing TT '21, I'd make it all the way to the activation window only to find it blank. After an hour of aggravation and research, I piecemealed this solution together which ultimately worked: (1) disabled all antivirus/firewall apps temporarily; (2) changed the display resolution to 800x600; (3) changed the application settings to launch as administrator (right-click app/properties/compatibility); (4) got the blank window, changed the display settings back to my original 1920x1080, which magically now showed a field to enter the activation code in; (5) however, trying to enter the code in the field was futile as no cursor shows up; click into the field as if you were going to enter the code, carefully/blindly enter the activation code INCLUDING dashes; (6) click on activate TT and voila! you get the next registration window. OMG, this was such a waste of time and disappointing having been a decades-old user of TT - never experienced anything like this before. Hope this helps all y'all!
