This has been an ongoing issue as reported in other threads, such as:
https://ttlc.intuit.com/community/state-taxes/discussion/unable-to-download-state-within-turbotax-bu...
As far as I can tell, it happens with all states. At least five different state downloads have reported this issue.
The only successful workaround is to call TurboTax customer service and ask them to manually purchase the state business download.
I had this exact same issue, spent almost an hour on the phone with TurboTax customer support (even after telling them exactly how to resolve it), and finally got the manual purchase performed. TurboTax then recognized that the state package had been purchased and downloaded it. Problem solved.
