>I know, it is some caching issue. If you do it from another machine, I don't think you would see this. This same thing you are seeing happened to Jim Saunders yesterday, and then he found it was a caching issue.

I looked into Installation log closer and installer runs .MSI file from the last Beta update (from C:\WINDOWS\Installer\folder) because SP1 RTM has the same version. As long as there's no difference between them it's okey.