Will add my 2 cents. I got the blank activation screen and found the advice about video drivers (nope), screen resolution scaling (nope), and the usual advice about closing everything else (didn't matter). I found that by dragging the activation window around, it eventually became visible. But clicking in the activation code window didn't show a cursor there. I saw earlier advice about blindly typing in the code, which I did, and clicked the Activate button. I got the "I know this is taking more than a minute" window indicating at least something was going on. Tried waiting that out, but eventually clicked the Activate button again, and that finally pulled up the registration page. Appears to be properly installed now, can close and reopen without any complaints.
