topic Microsoft Installer error: 1603, Fatal error during installation in Get your taxes done using TurboTax

Microsoft Installer error: 1603, Fatal error during installation

smisic1 — Tue, 24 Feb 2026 07:18:01 GMT

Hello, I can't update TurboTax. I get a "Failed to install update. Microsoft Installer error: 1603, Fatal error during installation." error message. I can't get past this error to start the software. I have already tried all of the steps to install the latest updates several times already. Can you put the most recent updates in an exe file to manually install please? I have the desktop software on disk from Costco.

Thank you.

Re: Microsoft Installer error: 1603, Fatal error during installation

Anonymous_ — Wed, 27 Sep 2023 17:05:36 GMT

How do I contact TurboTax? (intuit.com)

Re: Microsoft Installer error: 1603, Fatal error during installation

smisic1 — Fri, 29 Sep 2023 17:25:44 GMT

Thank you!