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Get your taxes done using TurboTax
FYI, this appears to have been a bug in C++ code introduced TT2020 that is not compatible with Big Sur. The TT2020 update issued by Intuit as of Jan 6, 2021 appears to have resolved this issue. Unfortunately, if you're running Big Sur, you're in a bit of a catch 22: if you're on the older version, you can't actually run TT2020 in order to let the autoupdater run to get you onto the newer version.
I was able to work around things by installing the offending version of TT2020 on a Catalina Mac, where it runs and auto-updates. Then, I copied that version of the executable over to my Big Sur Mac and ran it from there, and sure enough, it works just fine.
Alternatively, I suppose your best option is to contact Intuit Customer Support and ask for them to provide a web-based download link to the most recent version.
To be clear, it appears that you need to be running version 2020.r12.029 or later for Big Sur compatibility. I was on 2020.r01.013, which was a no-go for Big Sur.