Error 1603: Fatal error during installation.

[Thenstaking]

I've been struggling with a rather persistent and annoying issue when trying to install my application using the Advanced Installer project. I get the message "Error 1603: Fatal error during installation."

Other times, seemingly with the same MSI and setup, it fails with this 1603 error. This inconsistency makes it extremely difficult to determine the root cause.

I've checked the MSI log file but the log usually ends abruptly at the time the error occurs, with no clear indication of what the exact error is.

Has anyone else encountered this type of intermittent "Error 1603" with Advanced Installer? I'm going a little crazy trying to debug something that doesn't happen all the time.

[Catalin]

Hello and welcome to our forums,

That error usually happens due to a failing custom action.

Here is an article that sheds some more light over this error:

How to Troubleshoot MSI Error 1603: Fatal Error During Installation

Hope this helps!

Best regards,
Catalin