Specify the URL for the location of the engine. At run time, this is the location that Update.exe will use to download the engine. The default URL locations are live sites maintained by Macrovision for your convenience.

Both the 3.1 and 3.0 engines are available for download from the default URL (http://www.installengine.com/Msiengine30) listed for the Windows Installer 3.1 engine URL property. The appropriate version—either 3.1 or 3.0—is downloaded if needed, depending on what option is selected for the Windows Installer version.