Collaboration for Revit version 11 for Revit 2015 with Update 14 installed

This will apply to anyone who is using Collaboration for Revit 2015.

If you are installing the latest update for Revit 2015 which is Update 14 you will also need to uninstall your current version of Collaboration for Revit 2015 and install the latest: Collaboration for Revit v11. 

Take from the link above:

Autodesk Revit Update Release 14 is required to use Autodesk A360 Collaboration v11 for Revit 2015. The Autodesk A360 Collaboration v11 for Revit 2015 install will apply Autodesk Revit Update Release 14 if it is not already installed.

Read the Known Issues before installing.