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 Ethernet support is provided by native macOS drivers from OS version 10.11.
Some users updating to 10.15 have found their DisplayLink devices have stopped working. 5.2 software is designed to run on Mac OS 10.15, but the OS can disable our kernel extension during the udpate. Please check the kernel extension is enabled and screen recording is also enabled, to ensure DisplayLink enabled devices continue to work when migrating to 10.15.