The UpgradeCode property is a GUID representing a related set of products. The UpgradeCode is used in the Upgrade Table to search for related versions of the product that are already installed.
This property is used by the RegisterProduct action.
It is strongly recommended that authors of installation packages specify an UpgradeCode for their application.
Windows Installer 5.0 on Windows Server 2012, Windows 8, Windows Server 2008 R2 or Windows 7. Windows Installer 4.0 or Windows Installer 4.5 on Windows Server 2008 or Windows Vista. Windows Installer on Windows Server 2003 or Windows XP. See the Windows Installer Run-Time Requirements for information about the minimum Windows service pack that is required by a Windows Installer version.