TurboTax's website states that Windows 7 is still supported: https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
I'm running Turbo Tax 2018 (yes a older version) and the issue appeared this weekend too, on Windows 7. When I put TT on Windows 10 with the same file, it worked fine. However, I need the Windows 7 server to be working as I have to complete my taxes there.
