If you haven't seen it yet, take a look at the Patch Uninstall Custom Actions topic on MSDN. Assuming you're not using MSI 4.5, the one critical requirement which is easy to miss, is that this uninstall action must be present in the base .msi package. This is because Windows Installer (pre 4.5) effectively wipes out the patch and only then runs the sequence; at this point any actions that are only in the patch are gone.
As of this point I can’t guarantee that our clients have Windows Installer 4.5 on their machines.
AND, the base msi that was used on the Client pcs, does NOT have a CA in it that would allow me to reference it during a patch uninstall.
I have managed however, to make my current patch install another, non removable; patch first, so the uninstall Ca would be present in the base before my second patch is installed (and uninstalled.)
Hello, Ray, I know this is rather an old posting, and hope you respond. I'm facing the same issue that you had. So, I've created two different patches, one for changing CAs and NOT uninstallable, and the other for actually installing updated files. Now, how did you manage to install the first patch from the latest(current) patch? Thanks in advance!
