Actually this thread
https://ttlc.intuit.com/community/taxes/discussion/state-tax-is-not-working-on-turbotax-deluxe-2019-...
Seems to have the fix. Run the Microsoft fix-it tool, select installation problems, and then TurboTax wcaiper 2019 (might be a different name in different states). Then try download again.
No idea why support doesn't know this answer! It should be an official one specifically linked to state download issues .
