If you get an error message when opening the MultiTrans Client which states "MultiTrans could not find a license. The activation utility will be launched", there could be an issue on either the MultiTrans Client or the server.
The follow Knowledge Base article explains what to check and how to correctly configure the MultiTrans Client to retrieve a license from the server:
https://gateway.sdl.com/apex/communityknowledge?articleName=000012514