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These will often have a commandline unistallation option, just create a package pointing to the same files but using the different commandline parameters. Alternatively, if you check the registry of a machine with that product, you should see an uninstall string in the add/remove programs section. That is what the vendor adds so that users can perform an uninstall; that often works but you may have to research to find a parameter that makes the uninstallation silent.
Standard practice for me is a google search "How do I uninstall product X silently"
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