For Revit 2015 R2:
This update requires one of the following:
Autodesk Revit 2015 R2 for subscription customers (build: 20140905_0730)
Autodesk Revit 2015 Update Release 9 for R2 for subscription customers (build: 20150704_0715)
Autodesk Revit 2015 Update Release 10 for R2 Readme
Enhancements (not live yet):
Additional links will be added as they become available...