Matthew Sheets wrote:
*_Major Upgrade_*
/Advantages/
* Can set the UpgradeVersion OnlyDetect attribute to prevent a
clearing out of data during an upgrade uninstall/reinstall
/Issues/
* Creates multiple entries under Add or Remove Programs
If you use OnlyDetect, you're not creating a major upgrade; that's why
you have multiple entries in ARP. As the name implies, OnlyDetect
doesn't remove the previous version. If you keep your component GUIDs
stable and schedule RemoveExistingProducts late, then MSI won't
uninstall the component and the WiX custom actions won't trigger
uninstall behavior.
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