Basic MSI: How to check if a patch (small update) has been installed?
Basic MSI: How to simply check if a patch (small update) has been installed (or multiple patches)? (eg. across an update notification mechanism, external program)
If you have MSI APIs available to you, perhaps you can check the package code (or possibly other version markers depending on what changed in your updates) of the cached MSI package. You can find the package via lookup from the product code.
