Select the Windows Installer version to be installed by Update.exe. The Version 3.1 or 2.0 (best fit for system) option installs Windows Installer 3.1 on target systems that are running Windows 2000 SP3 or later; it installs Windows Installer 2.0 on other target systems.

If you select the Version 3.1 (requires Windows 2000 SP3 or greater) option or the Version 3.0 (requires Windows 2000 SP3 or greater) option, and the target system does not support version 3.x but does have version 2.0 installed, your patch will run, since the differences between versions 2.0 and 3.x involve only the mechanics of patching.

To prevent your patch from running on a system that does not have version 3.1 installed, set the Minimum Windows Installer Version property to `310`. To prevent your patch from running on a system that does not have version 3.0 or later installed, set this property to `300`. Note that these conditions are evaluated after Update.exe has had the opportunity to install version 3.1 or 3.0.