All,
The fix that worked for me is as follows:
I did a windows 10 update and windows updated several files this evening. Then I did a manual Turbotax update. After this I attempted to transmit my Federal and state return and received the error message that my software was not up to date and required updating. So inside of the program I did a Online Update and instead of giving me the message that my software was up to date this time it actually pulled a file with a 5/6/2021 date and it updated my software. Went back to transmit my returns and they transmitted with no problems.
If you are still having this issue please follow these steps and post whether it worked or not. My returns are filed and I am done for the 2020 tax season.
