The installer sets the UpdateStarted property when changes to the system have begun for this installation, including resuming a suspended installation.
UI condition statements use this value to select a dialog box. If this property is set, the user is asked after an error and cancellation whether to restore or to continue later.
||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.