I have to install SQL Server 2008 Express SP1 on a Windows Server 2008 R2 (64 bits OS) machine.
I have already found the following link:

Download details: Microsoft SQL Server 2008 Express Edition SP1

But the problem is that I cannot find the required tool Windows Installer 4.5 for Wndows Server 2008 R2 (64 bits OS).

I found only the tool Windows Installer 4.5 for Windows Server 2008 (64 bits OS) without R2:
x64 Platform: Windows6.0-KB942288-v2-x64.msu on this link:

Download details: Windows Installer 4.5

I have just tried to install x64 Platform: Windows6.0-KB942288-v2-x64.msu tool but already at the beginning I have found an error message that
says that the version is not correct.

Could you help me to find Windows Installer for a Windows Server 2008 R2 (64 bits OS) machine?

Thank you!