My desktop version of home and business won't load after an update failed. I can't even open it.

[solana314]

I'm using Turbotax 2020 home and business, desktop version. It has worked before and my return is almost done. I haven't been able to start Turbotax the last few days due to this issue.

[SteamTrain]

The only thing I can think of (if using a Windows computer) is to shut down and reboot your computer....there have been a few Windows updates recently, and partially-installed update has been known to cause problems with TTX.

[solana314]

I just tried rebooting and then started TurboTax again. It again tried to install updates and I got the following error (same one I keep getting):

Failed to install update. Microsoft Installer error. 1603, Fatal error during installation.

Check for solution.

When I try clicking the link for "Check for solution," it can't find one.

I clicked OK on it and then it says "restarting Turbotax" but it didn't ever start again, and Turbotax had just disappeared. 

[SteamTrain]

There's one FAQ page that suggests downloading and  installing the manual update for that problem:

https://ttlc.intuit.com/community/bugs-and-error-messages/help/error-1603-a-fatal-error-occurred-dur...

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But I know the manual update may be one update behind...but try it anyhow:

https://ttlc.intuit.com/community/updating/help/manually-update-turbotax-for-windows-software-basic-...

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After that, uninstalling TTX entirely and re-installing may be your only option....find your installation code first though.