Update Failing in Win 11, but works in Win 10

[flyinhigh]

I need to amend a tax return from 2021 and had to use TT 2021 to amend the return from that tax year.  I started up TT 2021 on my newer, Win 11 computer and when it tried to do the obligatory update, the update failed (with a 1603 error).  I even tried a manual update, but the super patch didn't work, either.  Also worth noting: when I started up TT 2023 on my Win 11 computer, it also failed updates with the same 1603 error (even though TT 2023 went through the update process just fine a week ago).

I went back to my old Win 10 computer (which I used, 3 years ago, to file my taxes for 2021) and TT 2021 went through the update process just fine.  

It makes me wonder if TT doesn't have some new problem updating on Win 11?

[Mike9241]

found on the web

Many users confirmed that the only solution to fix Fatal Error 1603 is uninstalling and re-installing TurboTax from scratch.

and here's from Turbotax

https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-delivery/error-1603-fatal-error-... 

[SteamTrain]

Also, make sure that last week's W11 Cumulative & .NET Framework Updates have been fully installed & computer rebooted before either trying to update, or re-install TTX again.

[flyinhigh]

I wish that were easy, but I don't happen to have the original CD handy (since I used it 3 years ago), so that puts me out of luck (according to support representative)