I discovered I can obtain more detailed information on the error. It says: "The client and server cannot communicate, because they do not possess a common algorithm." I found another discussion that said the problem is that my Windows 10 machine uses FIPS compliant algorithms for encryption, and TurboTax does not:
https://ttlc.intuit.com/community/taxes/discussion/2018-turbo-tax-deluxe-will-not-download-federal-o...
If that's the case, and I am unwilling to modify the encryption on my computer due to security requirements related to other uses of this computer, please tell me how I can obtain a manual download of the state software that was included in my purchase.
