When installing QuickBooks or a product update, the following error occurs:
Error 1603: The update installer has encountered an internal error
MSI returned 1603: Fatal error during installation.
This error can be caused by a damaged Microsoft Windows Installer file or a damaged QuickBooks Desktop installation.
Intuit recommends two solutions for this problem. The first solution may solve your problem, or you may need to try both to resolve the issue. For best results, perform the solutions in the order presented here.
Important: These troubleshooting steps may help resolve your issue. They focus on the Windows operating system, which is not an Intuit product. Intuit recommends if you are not comfortable doing these steps on your own, you can find expert assistance by consulting your computer's manufacturer or a Windows expert. If the difficulty persists after performing these steps, contact your computer's manufacturer or Microsoft.