I see what you mean, the one they made available ion the Exchange:
https://creative.adobe.com/addons/products/1315
I just installed this on my system, and it is just a repackaging of the Deprecated server behaviors extension that was packaged with DW CC.
They have just released DW CC 2014 and in that version are no longer adding the extension file int the application folder, but having you install it from the exchange. It is the same version though.