ChrisH - Just to make things more confusing, this morning I updated the Windows 7 disk in my old laptop with the latest Microsoft updates and then installed TurboTax 2018. It installed fine and also installed the updates. (Note - I did not fill out the registration info, so it was not "locked" to that particular computer.) I then took out the Windows 7 disk and installed my Windows 10 SSD disk (makes the old laptop run much faster!). I made sure it was also updated with the latest Microsoft updates (also running version 1809) and then installed TurboTax 2018. This also installed fine and the updates also installed normally. So perhaps this is not a .NET Framework error after all, since my Windows 10 laptop works fine, but my Windows 10 desktop does not and they are on the same Microsoft versions.
I suspect a clue can be found in the C:\ProgramData\Intuit\Common\Update Service\v4\Logs\ClientLog.txt file because I can see the error details there. I would like to send this log to Intuit for their analysis, but I haven't a clue how to do it. Perhaps if they monitor this, they will reach out to me.
