Service Pack 5 for Vectorworks 2015, available from THIS LOCATION  addresses the majority of the compatibility issues introduced since OS X 10.10, however there is a particular UI element that you may come across that can be worked around:   After switching focus from Vectorworks 2015 to another application on OS X 10.11, you may notice that any dialog boxes (Such as Tools > Organization) may not reappear after switching focus back to Vectorworks 2015, either via the use of Spa