DisplayLink Mac OS X Software
From this page you can download a driver for your DisplayLink® enabled USB graphics device that is incorporated in your dock, adapter or monitor. This software provides support for the DisplayLink enabled video outputs. The audio and Etherent support is provided by native OS X drivers from OS X 10.11.
This driver is for the applicable Mac OS X* operating systems listed below. DisplayLink recommends v2.5 software which addresses many of the previous identified problems.