Thanks for posting the requested info.
From the installer log it seems that something goes wrong in copying the agent plist files in /Library/LaunchAgents/ directory. It could be a permission issue.
Could you please do the following step:
1) run the DisplayLink uninstaller
2) run DiskUtility, select your system partition and select Repair Disk Permission
3) run the installer
I hope this helps, but before restarting the machine, could you please grab the installer log once again, list the files under /var/tmp/DisplayLink.app/ and post these new info here?
Thanks
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