> Does Wix / MSI support product downgrade ? Sort of, but not fully. You can schedule RemoveExistingProducts after InstallInitialize to remove the old version before installing the new version. By this point though the costing has already happened so Windows Installer has already decided what it thinks needs to be done with the files, despite the fact that RemoveExistingProducts changes all that. You can specify the REINSTALLMODE property to have the value "amus" which will force the files from the installer you're running to overwrite any existing ones. This is needed to make sure that files get downgraded to the lower versions your older install will be carrying. This is only safe though if you have no shared components. In this case you'll need to uninstall the existing version via some other method (i.e. a bootstrapper) before installing the new/old one.
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