Recently we published a Rollup for System Center Virtual Machine Manager 2008 on Microsoft Update.
When your SCVMM Server is not directly connected to the Internet you may have the need to download the package from another machine
You can get the fix from http://catalog.update.microsoft.com and specifing Article 961983.
You receive a package containing a file vmmServer64update.msp
Transfer this file to the target SCVMM server and install it with the following command:
msiexec /p vmmServer64update.msp BOOTSTRAPPED=1