Best example, Adobe Indesign CS2
The MSI requires Administrator logged in (that how it is worded).
Really silly, but hey, Adobe.
Trying to install it with unsecure system user gives same error message

I even edited the msi & took away this condition from LaunchConditions

Same happens, anybody knows of any normal way to do it?

Of course I can "cheat" & force to use ie cpau, but that is not what I would need