I made an entry on this bulletin board regarding 2019 turbo tax issues on my iMac, which was a late 2013 model no longer supported by Apple and was constantly freezing in one way or another. I found a solution from some other members of this bulletin board, tried several until one actually worked. The Intuit people were less than helpful and closed my ticket with full knowledge that they had not solved the problem. I promised no more TT, but I bought a new MacBook recently, using Big Sur, which worked with no problem using Turbo Tax 2020.
I think the ongoing problems being reported are caused by an interaction of the Apple OS and TT, that causes various anomalies when using TT, particularly with older OS systems. I would suggest that you read the various recommended fixes of members of this bulletin board and try several. One of them worked for me last year. You can also get a refund for TT within 60 days of purchase, and then maybe buy HR Block.
Good Luck, SHB
