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Sometimes running TurboTax as an administrator resolves these issues.
Additionally, see: https://ttlc.intuit.com/community/troubleshooting/help/troubleshoot-blank-screens-missing-buttons-or...
Same problem TurboTax 2020 Premier...auto-update: initiates update, seems to download and then install which ends up as "Failed to install update. Microsoft Installer error: 1603, Fatal error during installation." So, went to manual update...worked fine. Then open TurboTax which of course checks for updates right away...cycle continues - same error as original attempt. This is not the first update I have run; also, have TT for Business 2020 installed on same machine - which is not encountering any issues.
@donsfolly Please see the TurboTax FAQ Error 1603: "A fatal error occurred during installation or updating" for assistance with the error code you are receiving.
If the issue still persists, please reach out to TurboTax customer support: What is the TurboTax phone number?
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