As you may already know that Service Pack 2 for Windows Server 2008 and Windows Vista (SP2) is available for download from Microsoft download center [link]. MSI version 4.5 is natively included as part of SP2. The version of Windows Installer is 4.5.6002.18005 across all architectures and platforms.
If you have already installed the MSI 4.5 redistributable on your Vista or Server 2008 SP1 machine, you can upgrade to SP2 over the MSI 4.5 redistributable. After installation of SP2, the Windows Installer version on your machine will be 4.5.6002.18005. The upgrade would have no effect on the functionality provided by Windows Installer 4.5.
Other notable hotfixes for Windows Installer 4.5 also included in SP2 are;
· KB 958655 – Error message when you use Windows Installer (MSI) 4.5 to install multiple MSI packages in Windows Server 2008, Windows Vista, Windows Server 2003 or Windows XP: "API call rejected - No actions in Context".
· KB 967756 – After you uninstall some software updates in Windows Vista or in Windows Server 2008, some assembly files may still reflect the updated version instead of the original version of the files
· KB 958756 – The customized properties for an .msi package installation are reset to their default values after you install Windows Installer 4.5
[Author: Zainab Hakim]This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm.