Yep.....should be interesting to see what happens if they test installation on Windows 20H2.
My 2019 (and earlier) TTX software is working on 20H2, but they were already installed when my system upgraded, so that doesn't mean much....other than upgrading to 20H2 won't trash already-installed TTX software. And I won't bother buying/installing 2020 stuff until January since the early software is generally so error prone ( if I can resist doing so).
A couple windows updates came out last night...you might get those installed and try again in case there is some background bug Microsoft picked up recently that helps. I realize...that's just a shot in the dark.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
