KB 2492386, Microsoft's April 2011 Application Compatibility Update isn't only provided for Windows 7 SP1 and Windows Server 2008 R2 SP1, and their RTM Builds, but also for all supported versions of Windows, including: Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008.
The Windows Application Compatibility Update is a software update that improves the compatibility experience. The refresh is being served automatically through Windows Update, but at the same time it's available for direct dowload to users that want to install it manually.
For Windows 7 SP1 this update will introduce:
Microsoft .Net Framework 4.0 - Updates the application's functionality. After you apply this update, incorrect custom actions in the NGenRemoveNicPFROs family are disabled when you install the Microsoft .Net Framework 4.0. Therefore, you can successfully install the .Net Framework 4.0, when incorrect custom actions were not cleaned up.
Microsoft Visual Studio 2010 or Microsoft Visual Studio 2008 - Updates the application's functionality. After you apply this update, the "Auto run" shim isn't included in the module list when you start the Visual Studio 2010 or the Visual Studio 2008 solution file.
Home and Small Business Server (HSBS) SKUs - Puts a hard block on HSBS SKUs in Windows 7 Service Pack 1.
With a hard block in place, HSBS SKUs willn't be able to run on Windows 7 SP1, a measure considered necessary for severe incompatibility scenarios.
If you are interested in manual download, you may refer KB2492386.