Hi There,
This problem is closely related to your original post. Basically, the original EXE files are basically MSI's internally, I might suggest doing an Administrative install, and then applying the patch to the Administrative image:
This will extract an uncompressed MSI image:
setup.exe /a
This will apply the MSP to the uncompressed image:
msiexec.exe /a package.msi /p patch.msp
once you have an Administrative image with the patch applied, you can either convert the resultant MSI to a project file to re-compress it using InstallShield's 'Wizard' mode. This is under File -> Open -> Open As -> Wizard, then browse to the MSI file.
Hope this helps.