Manual Uninstall

[Carlo]

To uninstall on 10.9/10.10 you should remove all of the following files (some may not be present on your system) then reboot:
/Library/Extensions/DisplayLinkDriver.kext
/Library/Extensions/DisplayLinkEthernetDriver.kext
/Library/StartupItems/DisplayLinkAgent
/Library/LaunchAgents/com.displaylink.useragent.plist
/Library/LaunchAgents/com.displaylink.useragent-prelogin.plist
/Library/LaunchDaemons/com.displaylink.launchd.plist
/Library/LaunchDaemons/com.displaylink.displaylinkmanager.plist
/Library/Preferences/com.displaylink.plist
/Library/Receipts/DisplayLink Software Installer.pkg
/Applications/DisplayLink/DisplayLink Software Uninstaller.app
/Library/Application Support/DisplayLink
/Library/PrivilegedHelperTools/DisplayLink
/var/db/receipts/com.displaylink*
Administrator access is required.

On 10.8 the kext files are in /System/Library:
/System/Library/Extensions/DisplayLinkDriver.kext
/System/Library/Extensions/DisplayLinkEthernetDriver.kext

Cheers,
Carlo