@akuarius I don't have the newest version of Samplitude, but in my version I can just drag and drop the Syn-file into a track and it will work fine. Music Maker dropped support for Syn-instruments in version 2021 if I remember it correctly. Doesn't work any longer, even with drag and drop.
Your first post here has been made to a thread asking about using certain instruments in Samplitude. Unfortunately, your post really has nothing to do with that question and so has been hidden in order to not allow this thread to be derailed!
Please start a new thread with your question. Also, are you aware there is a dedicated forum for users of Samplitude Prohere? I think you would be best advised to register at and repost your question there.