This setting specifies the location from which the setup launcher downloads the Windows Installer 3.1 or 3.0 engine, if needed. This property is ignored unless the MSI Engine Location setting for the current release is set to Download Engine from the Web. Do not specify the file name in the URL.

The default URL (http://www.installengine.com/Msiengine30) is a site maintained by Macrovision for your convenience. Both the 3.1 and 3.0 engines are available for download from this location. The appropriate version—either 3.1 or 3.0—is downloaded if needed, depending on what option is selected for the MSI Engine Version setting for the current release.