How to unpack InstallShielded game patch?

[Squidge]

setup.inx is indeed the script.
you should also find a setup.exe somewhere. try deleting all the files in your temp dir before launching the setup program. then copy all the new files out.

as for putting them back together - as long as you can find the setup.exe, you don't need to A simple self-extracting zip/rar archive will be fine.