The Microsoft Windows Installer (MSI) is the application installation and configuration service for Windows. These download packages will update the version of Windows Installer on your system to version 4.5.
Version 4.5 of the Windows Installer has several new features,
Multiple Package Transaction: In a multiple package transaction, you can create
a single transaction from multiple packages. In a multiple package transaction,
a chainer is used to dynamically include packages in the transaction. If any of
the packages do not install as expected, you can roll back the installation.
Embedded UI Handler: You can embed a custom user interface (UI) handler in the
Windows Installer package. This makes a custom UI easier to integrate. You can
also invoke an embedded UI handler from the Add or Remove item in Control Panel.
Or, you can invoke an embedded UI handler during a Windows Installer repair
Embedded Chainer: You can use the embedded chainer to add packages to a multiple
package transaction. You can use an embedded chainer to enable installation
events across multiple packages. For example, you can enable the
install-on-demand events, the repair events, and the uninstall events across
Update Supersedence Resiliency: This feature enables you to correct for changes
in the FeatureComponent table during supersedence.
Shared Component Patching Resiliency During Uninstall: This feature makes sure
that the most recent version of a component is available to all the products.
Custom Action Execution On Update Uninstall: This feature enables an update to
add or change a custom action so that the custom action is called when an update
After installation of this package, the version of Windows Installer on the
system will be upgraded to 4.5.
Tools and Utilities
Product page: here