I can confirm this is the issue.
After turning off the execution policy we could install the drivers without issues.
I wrote this script to make it easier.
Code:
Set-ItemProperty -Path HKLM:SOFTWARE\Policies\Microsoft\Windows\PowerShell -Name Executionpolicy -Value Unrestricted
\\fileserver\share\DisplayLink_7.9M0.exe -silent -noreboot
Set-ItemProperty -Path HKLM:SOFTWARE\Policies\Microsoft\Windows\PowerShell -Name Executionpolicy -Value allsigned