That is a useful line. Thank you for that. I feel like someone just turned the light on.
The error I can see now is "Error 740 Desc: The requested operation requires elevation". This installation is for Windows 7, and I have the GPO set to the following:

- User Account Control: behavior of the elevation prompt for administrator in Admin Aproval Mode: Elevate without prompting
- User Account Control: Detect application installation and prompt for elevation: Disabled
- User Account Control: Run all administrators in Admin Approval Mode: Enabled.

This GPO works great for MSI files, but I guess not for EXE. All users are local admin of their own computers. Do you think there is a workaround here? Is there a switch to "run as administrator" in Windows 7?