Revit 2015 Update Release 9 and Revit 2016 Service Pack 2 are now available.
This update applies to the following products:
Applies to Building Design Suite 2015, Infrastructure Design Suite 2015, Plant Design Suite 2015, Revit 2015, Revit 2015, Revit Architecture 2015, Revit MEP 2015, and Revit Structure 2015.
For the above products, the version of Revit should be detected and the appropriate update will be installed.
Source: Revit Clinic