I have used the ORCA MSI File Editor a few times to remove stupid restrictions from MSI files.
It is a pain to get as it is part of the Platform SDK - which is over 250MB whereas ORCA is about 1.6 MB
I found that you can download it from this URL http://astebner.sts.winisp.net/Tools/Orca.zip
Orca.exe is a database table editor for creating and editing Windows Installer packages and merge modules. The tool provides a graphical interface for validation, highlighting the particular entries where validation errors or warnings occur.
Note: If you are wanting to remove restrictions on a setup program from installing check the...