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Is it any way in WIX to detect that a third-party application with a specified upgrade code is installed and what is it’s installation folder? I can suggest a custom action is required, but what exactly to do in such custom action? Is it possible to detect such things in VBS custom action?
It really depends on the application. Most applications publish a registry key that can be used to detect them. In that case you just need a
RegistrySearchelement, no custom actions necessary. If the application was installed via MSI, sometimes aComponentSearchis better.