Several things to try in this order.
Restart the Mac.
Be sure that System Preferences -> Security & Privacy -> General -> Allow apps downloaded from App Store and identified developers is checked.
Go to the Applications folder and select the TurboTax application in the Finder and right click with the mouse (or control click) ans select the top "open". That should force the first open. After that it should open normally.
Be sure the user account in an administrator.
https://ttlc.intuit.com/questions/1899267-administrator-rights-mac
Corruption could have occurred in the Application or in an associated preference or support file.
The best remedy is to totally uninstall TurboTax and all associate files and then re-install. That will not delete or change any .tax2020 data file that had already been created with the tax data.
To uninstall the application and all associated files need to be deleted and then the application reinstalled. If there was a state then the state must also be reinstalled.
To remove TurboTax from your computer, you'll need administrative rights.
Here is a FAQ for how to uninstall Mac
https://ttlc.intuit.com/questions/1901210-remove-uninstall-turbotax-for-mac
https://ttlc.intuit.com/questions/1901209-reinstall-turbotax-mac
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
