Here is what I found on the DisplayLink* website.
Looking for Windows 8.1 driver?
DisplayLink's current release below is not supported on Windows 8.1.
DisplayLink have a beta release driver for Windows 8.1 available on the DisplayLink forum. The latest beta can be downloaded from this thread. If you find any issues with the beta Windows 8.1 driver, please check the threads in the forum or post a new thread.