Fix your broken driver for macOS High Sierra (10.13.6)!
Having recently upgraded to High Sierra on a Mac that can't use Mojave I am now stuck with a completely useless Asus MB16AC that was supposedly enabled for use on Mac by your driver.
Your supposed "fix" of extending via Airplay doesn't work. In Preferences, even when DisplayLinkUserAgent.app is enabled under Accessibility in the Security tab, when you got to the Displays Preferences the Airplay Display setting cannot be set to DisplayLink ("Could not connect to DisplayLink") and -- crucially -- the Arrangement tab of the Displays dialog does not appear! That leaves the MB16 stuck in mirroring mode, which is of no help (why have an extra monitor showing exactly what's on the main monitor?).
If you claim to offer a workaround, aren't you duty-bound to check that the workaround itself actually works? People relied on your driver when making their purchases, thus you are responsible for making it work as advertised, or at least coming up with a workaround that actually works. Anything else is unethical and unacceptable. Please, fix this now!