When Unison Driver files are manually copied from external media, typically into 'C:\Program Files\Pacom Systems\Unison\Client\Drivers\xxx\',
they will in most newer Windows version be automatically blocked.

This will result in no property pages being show on the Unison Client for the specified driver.

If viewing the Unison Debug Monitor for the 'Client' channel, it will show the following log when clicking on a node property page: 

(INFO)    "Located Property Page Assembly for Driver <xxx> - Path: C:\Program Files\Pacom Systems\Unison\Client\Drivers\xxx\Pacom.Unison.Drivers.xxx.PPage.dll"
(WARNING) "Failed to load Property Page Assembly for Driver <xxx>. Exception: Could not load file or assembly file:///C:\Program Files\Pacom Systems\Unison\Client\Drivers\xxx\Pacom.Unison.Drivers.xxx.PPage.dll
           or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)"


In order to unblock all files, go to the relevant folder - 'C:\Program Files\Pacom Systems\Unison\Client\Drivers\xxx\' in the above example - 
open Powershell as admin and then run the command:

PS C:\Program Files\Pacom Systems\Unison\Client\Drivers\xxx> dir -Recurse | Unblock-File

Once all files are unblocked, the Unison Client might have to be restarted before the files are shown.