Took me hours
Hi,
I had the same issue mb pro Mojave with Asus ZenScreen, It took me hours and about 30 restarts...
I've got it to work on Mojave 10.14.1 with the display link version 4.3 Beta 6.
I was missing a key step which is after you allow display link in privacy/accessibility checkbox you have to go back to privacy&security/General and at the bottom of the panel there is "Display link was blocked..." click allow
Hope this helps
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