SQL Server 2008 Books Online installer error in Vista

When I ran the installer for SQL Server 2008 Books Online (download here) I got an error.

This installation package cannot be installed by the Windows Installer service.  You must install a Windows service pack that contains a newer version of the Windows Installer service.

How Vista is not auto-updated with the latest installer is beyond me, but here's what you have to do.

  1. Download the new installer package.
  2. That page says you need to use wusa.exe to install the package, but if you just double-click on what you downloaded it will do that automatically.
  3. Restart.  (Yes, I tried not restarting, but it doesn't work until you restart).
  4. Bask in brand-new installer glory.
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