Gary, I think the OP is saying that he has TP8 working on an earlier version of Windows, wants to upgrade Windows to 8.1, but the compatibility checker is saying that TP8 won't work on Windows 8.1
He is asking if anyone has tried this BEFORE he goes ahead and upgrades Windows, only to find that he can't use TP8 any more. He can't uninstall Windows 8.1 if TP8 doesn't work.
Sorry I can't help; I'm ignoring Windows 8 and waiting for 9, which is due out in October.