Instead of downloading a return you should be able - once you have installed the desktop software - to click 'continue from TurboTax online' and then the return itself along with all of it's forms would be downloaded into the already open software.
But the error indicates that you haven't installed the state forms into your desktop program. So you should
- close the return that you are trying to open,
- go to 'start a new return',
- go to state taxes,
- download the states that you need,
- close TurboTax,
- reopen TurboTax,
- then open the file you are trying to open.
That should solve the problem.
@txtrb0
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