There are two updates available for System Center 2012 R2 Virtual Machine Manager: One for servers and one for the Administrator Console. The KB article also contains the installation instructions for Update Rollup 8 for System Center 2012 R2 Virtual Machine Manager.
For complete details as well as a download link, please see the following:
KB3096378 - Description of Update Rollup 8 for System Center 2012 R2 ( https://support.microsoft.com/en-us/kb/3096378 )
J.C. Hornbeck | Solution Asset PM | Microsoft GBS Management and Security Division
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VMM 2012 R2 UR8