I purchased a CableCreation USB 3.0 to HDMI adapter that uses the DisplayLink driver. I've followed the installation instructions for driver 4.3 and am only able to mirror my original display to the external monitor that I've hooked up with the adapter. When I click on the AirPlay icon in my systems tray, it doesn't show Display Link as an option to select, so I'm not able to select the "Use as Separate Display" option, as the instructions outline. Not sure what to do?