TurboTax Desktop Software does run on Mac OS Big Sur. Please see this TurboTax FAQ, for the minimum system requirements for MAC, Minimum system requirements for TurboTax Mac softw...
Please see this TurboTax FAQ for troubleshooting steps, Troubleshoot TurboTax for Mac download issues
I also recommend uninstall and reinstalling using this TurboTax FAQ, Remove and reinstall TurboTax for Mac
Please make sure your Mac OS is up to date.
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