Download the file that is appropriate for your operating system version and platform.

For Windows Vista, Windows Vista Service Pack 1 and Windows Server 2008:
x86 Platform: Windows6.0-KB942288-v2-x86.msu
x64 Platform: Windows6.0-KB942288-v2-x64.msu
IA64 Platform: Windows6.0-KB942288-v2-ia64.msu

For Windows XP Service Pack 2 and Windows XP Service Pack 3 (32-bit platforms):
x86 Platform: WindowsXP-KB942288-v3-x86.exe

For Windows Server 2003 Service Pack 1, Windows Server 2003 Service Pack 2 and Windows XP 64-bit Editions:
x86 Platform: WindowsServer2003-KB942288-v4-x86.exe
x64 Platform: WindowsServer2003-KB942288-v4-x64.exe
IA64 Platform: WindowsServer2003-KB942288-v4-ia64.exe

For complete information on installing or upgrading Windows installer, including command line options, please see the Windows Installer Start Page on MSDN. 

======================================
Windows Installer Redistributables 4.5
======================================

The Windows Installer redistributables may only be redistributed as part 
of the following packages:
	Windows6.0-KB942288-v2-ia64.msu
	Windows6.0-KB942288-v2-x64.msu
	Windows6.0-KB942288-v2-x86.msu
	WindowsServer2003-KB942288-v4-ia64.exe
	WindowsServer2003-KB942288-v4-x64.exe
	WindowsServer2003-KB942288-v4-x86.exe
	WindowsXP-KB942288-v3-x86.exe

You may not redistribute any of the DLLs in these packages except by using the files listed above.
You may not modify any of the packages or the files contained in them.

These redistributables are either self-extracting executables (EXE) or Windows Update Standalone
Packages (MSU) that will install the Windows Installer redistributables only if there is not a more
recent version of the DLLs in the system directory. They will also write the registry keys required
by Windows Installer.

In addition to the rights granted in Section 1 of the Microsoft Platform 
Software Development Kit End User License Agreement ("EULA"), with 
respect to the Redistributable Code, you have the following 
non-exclusive, royalty free rights subject to the
Distribution Requirements detailed in Section 1 of the Agreement:

(1) You may distribute Windows6.0-KB942288-v2-ia64.msu, Windows6.0-KB942288-v2-x64.msu,
Windows6.0-KB942288-v2-x86.msu, WindowsServer2003-KB942288-v4-ia64.exe,
WindowsServer2003-KB942288-v4-x64.exe, WindowsServer2003-KB942288-v4-x86.exe,
WindowsXP-KB942288-v3-x86.exe for use only on Windows XP Service Pack 2, Windows XP Service Pack 3,
Windows Server 2003 Service Pack 1, Windows Server 2003 Service Pack 2, Windows Server 2008,
Windows Vista and Windows Vista Service Pack 1.
