A new KB has been released that makes it simple to know what build of VMM you are running. This is important as you should always be at the latest Update Rollup or Service Pack possible. By knowing your build number you can identify updates that need to be installed. Find your build number on the list, then look for a higher build number in the same release of VMM. Best of luck!
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How to determine the version of Virtual Machine Manager
|System Center 2012 SP1 RTM||KB||Date Released||3.1.6011.0|
|System Center 2012 SP1 Update Rollup 1||2785682||
|System Center 2012 SP1 Update Rollup 2||2802159||
|System Center 2012 SP1 Update Rollup 3||2836751||
|System Center 2012 SP1 Update Rollup 4||2879276||
|System Center 2012 R2 RTM||3.2.7510.0|
Denis pointed out that there is a similar list here. Thanks!