I have personally installed TTax 2019 Premier on my Win 7 machine successfully. I have also successfully applied several updates and installed the state software as well.
You have to consider that TTax does not fully support TTax 2019 on Win 7 they do not prevent installation. The policy is if it installs and works there is no problem; however if you encounter any problems in the future with Win 7 they will not provide any official assistance.
My view is that if you encounter a 'tax related' problem it would not be unique to Win 7, thus at some point if that same problem is reported by a Win 10 user the flaw would be corrected. But, if it is related to a Win 7 issue there would be no forthcoming fix.
A word of caution, during the installation (and again each time you launch the program) it will nag you to upgrade to Win 10.
Caveat Emptor
