Thanks for reaching out to us, I am sorry this is not working after the OS update.
While we do not currently support MacOS on any of our USB docking stations or graphics adapters, there may be an easy fix to restore functionality with the new driver.
After downloading and launching the “DisplayLink USB Graphics Software for macOS 5.0.1.dmg” file select the “DisplayLink Software Uninstaller” from the DisplayLink Installer application. This will remove previous DisplayLink drivers an data from the system that may be interfering with the new driver. The system will need to restart to complete this software removal.
When completed and booted back to the desktop, please disconnect the Plugable docking station and start the installation again, this time selecting “DisplayLink Software Installer.pkg”, again the system will restart and when back at the desktop please reconnect the docking station to see if this has resolved the issue.
Please let me know if this helps.