I know that if you have, for instance, a concurrent license, and you look in your Arbortext...\bin directory, there will be a DLL file named "elmdlm.dll". If you have a fixed license, there will be one named "elmdsl.dll". You can add the use of a fixed license to a PC with a concurrent license that you want to use when it is disconnected from your network where the concurrent license is managed. You would usually do this for a laptop on which you want to use Arbortext while on travel.
Conversely, you can do the opposite, so that a fixed-license-only PC can use a concurrent license on a network with a server-based license manager (although why you would want to do this if you already have a fixed license is beyond me).
Anyway, you can do this by copying the desired DLL from the Arbortext.../dll folder and pasting it into the Arbortext.../bin folder.
I believe this works for all versions of Editor up to 5.2. I am not sure about newer versions.