Microsoft System Center Virtual Machine Manager 2008 R2 SP1
Later "today" you can download VMM 2008 R2 SP1.
SP1 adds support for for Dynamic Memory and RemoteFX on Hyper-V
https://technet.microsoft.com/en-US/evalcenter/cc793138.aspx
More info on this link:
https://www.microsoft.com/systemcenter/en/us/virtual-machine-manager.aspx
Now you can get the Service Pack 1 on Technet https://technet.microsoft.com/en-us/subscriptions/securedownloads/default.aspx
If you have SCVMM running the you can upgrade to SP1 with Windows Update