If you already have FEZ working for you, you do not need to install this release.
This SDK can be downloaded at the same link you had before and it is marked as QFE 1:
In the past you had you had to copy a DLL from GHI SDK to Micro Framework folder. This is no longer needed with this SDK. Other than that, not a lot changed.
There is new GHI SDK online but it only removed the DLL file and no other changes.