Muse-Sounds installed to a different location, Muse-score does not see them.

Hello,
In Muse-Hub you have the possibility to store the Muse-Sounds to a different location than the default location.
In linux the default location is /srv/muse-hub/downloads/.
Because i do not have 5Gb free disk space i have installed the Muse-Sounds to a different location.
Everything looks OK but when i open a score or Midi file there in no possibility to select the Muse-Sounds beside the MsBasic sounds.
When i check the View/Playback options/ the Muse-Sounds are checked Active. See picture.
I don't know what i did wrong.
Any help would be appreciated.
Thanks