I have 32-bit and 64-bit versions of my installer for the same product which have (nearly) the exact same code & custom action sequence (there are only minor differences which are not relevant to this issue) To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel. Installation of this version cannot continue. I want my installer to detect whether it has already been previously installed and if so display my own custom msg instead of showing the default Windows Installer error:Īnother version of this product is already installed.
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