Tony Hoyle wrote: > I think you meant minor upgrades there. > > Major upgrades uninstall the old product first so there isn't any issue > with version numbers. > Not exactly. MSI ignores the fourth field in ProductVersion so it doesn't differentiate among ProductVersions that differ only in the fourth field. So if you set UpgradeVersion elements to detect when the "same" version is installed, it will treat all 1.0.0.x versions as the same. You can do "blind" major upgrades so any version is installed (or any version greater-than-or-equal-to), which would let you increment just the fourth field.
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