Here is the correct link to download the script that will guide you through solving the KEXT cache issue:
https://www.displaylink.com/downloads/file?d=262
In case the script is blocked by Gatekeeper (you should see a popup message saying
"“dl_cache_fix_wizard.command” can’t be opened because it is from an unidentified developer."),
please open System Preferences->Security &Privacy->General tab and click on "Open anyway" button.