This update includes the same performance enhancements available in the last client:
- Improves scan times for Windows Update
- Improves the speed at which signature updates are delivered
- Enables support for Windows Installer reinstallation functionality
- Improves error messaging
The update will be slowly rolled out via Windows Update and WSUS over the next two months. You can also download the update directly from Microsoft here.
It may be important to know that Windows Update will automatically update the Windows Automatic Update client software, even if the computer is configured not to download automatic updates. The only way to prevent this is to completely turn off Automatic Updates (not recommended).