topic Program update failed with Microsoft installer error 1603 though I followed the basic instruction to update after log in as administrator, disabled firewall/antivirus. in Get your taxes done using TurboTax https://ttlc.intuit.com/community/taxes/discussion/program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruction-to/01/2820664#M1023944 Mon, 23 Feb 2026 10:44:26 GMT gaudipak 2026-02-23T10:44:26Z Program update failed with Microsoft installer error 1603 though I followed the basic instruction to update after log in as administrator, disabled firewall/antivirus. https://ttlc.intuit.com/community/taxes/discussion/program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruction-to/01/2820664#M1023944 Mon, 23 Feb 2026 10:44:26 GMT https://ttlc.intuit.com/community/taxes/discussion/program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruction-to/01/2820664#M1023944 gaudipak 2026-02-23T10:44:26Z Re: Program update failed with Microsoft installer error 1603 though I followed the basic instruction to update after log in as administrator, disabled firewall/antivirus. https://ttlc.intuit.com/community/taxes/discussion/re-program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruction/01/2820673#M1023947 <P>Contact Support.</P> <P>&nbsp;</P> <P><A href="https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/contact-turbotax/L2y9ZKpQB_US_en_US" target="_blank">How do I contact TurboTax? (intuit.com)</A></P> Wed, 18 Jan 2023 20:18:53 GMT https://ttlc.intuit.com/community/taxes/discussion/re-program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruction/01/2820673#M1023947 Anonymous_ 2023-01-18T20:18:53Z Re: Program update failed with Microsoft installer error 1603 though I followed the basic instruc... https://ttlc.intuit.com/community/taxes/discussion/re-program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruc/01/2830008#M1028777 <P>Please see this Turbo Tax help article on Error 1603. &nbsp;</P> <P>&nbsp;</P> <P><A href="https://ttlc.intuit.com/community/bugs-and-error-messages/help/error-1603-a-fatal-error-occurred-during-installation-or-updating/00/26193" target="_blank">A fatal error occurred during installation or updating</A></P> Tue, 24 Jan 2023 17:41:07 GMT https://ttlc.intuit.com/community/taxes/discussion/re-program-update-failed-with-microsoft-installer-error-1603-though-i-followed-the-basic-instruc/01/2830008#M1028777 SForrestLO 2023-01-24T17:41:07Z