For what it is worth, this seems to be a common problem this year, which TurboTax support doesn't seem to acknowledge or understand yet. There are about a half dozen forum posts, or more, with this same problem.
I had problems with Win/download/Deluxe and CA state.
I went through about a week dealing with the social media support folks (I wasn't around with my PC to phone in). I forceably uninstalled and reinstalled about 3 times.
But, you shouldn't do any of that.
Call turbotax support, and they will screenshare with you, and you show them that it is stuck. Ask if there is a standalone download of your state -- which they can add to your account, and you download from "my downloads". The download took about 10 seconds, and installed in under a minute, and then I was able to continue with my return.
In case any TTAX software technical folks care to try to actually fix this problem:
Though no error is shown to the user, there IS an error logged in
C:\Users\[YOUR USERNAME]\AppData\Roaming\Intuit\TurboTax\TY19\ErrorLog\TTWin.A5830904-[somedate].log
In that file, I see the following error code
2020-01-25 15:12:05,357 [1] 2019.41.14.207 ERROR Intuit.Ctg.Wte.Service -
TaxReturnStates::AddStateToReturn threw exception starting/editing S2019ZCA
2020-01-25 15:12:05,357 [1] 2019.41.14.207 ERROR Intuit.Ctg.Wte.Service -
Unknown Group Template Id: S2019ZCA; ServiceName=TaxDataModel; ServiceOperation=CreateGroupCopy; ImplementationClass=ManagedFacade.TpsTaxDataModelServiceImpl
2020-01-25 15:12:05,357 [1] 2019.41.14.207 ERROR Intuit.Ctg.Wte.Service -
Intuit.Ctg.Wte.Service.ServiceOperationException: Unknown Group Template Id: S2019ZCA; ServiceName=TaxDataModel; ServiceOperation=CreateGroupCopy; ImplementationClass=ManagedFacade.TpsTaxDataModelServiceImpl
at ManagedFacade.TpsTaxDataModelServiceImpl.CreateGroupCopy(CreateGroupCopyContext context)
at Intuit.Ctg.Wte.Service.TaxDataModel.TaxDataModelService.CreateGroupCopy(CreateGroupCopyContext context)
at Intuit.Ctg.Wte.Service.TaxDataModel.TaxReturnStates.FindOrCreateGroupCopy(String formsetId)
at Intuit.Ctg.Wte.Service.TaxDataModel.TaxReturnStates.AddStateToReturnByFormsetId(String formsetId)
