Please see the TurboTax FAQ below for assistance with your TurboTax Mac download not opening: TurboTax for Mac won't open when installed
If this does not fix this issue, its possible corruption could have occurred in the application and you may want to try uninstalling TurboTax and all associate files and then re-install.
Please see the below link on how to uninstall and reinstall TurboTax for a Mac:
Remove and reinstall TurboTax for Mac
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