I'VE FOUND MY ANSWER. DON'T BOTHER ABOUT MY POST 😋
Hey guys!
I'm getting crazy!! I'm on Macbook pro running with Ventura 13.7. I've downloaded Xfer Serum (official version). It's in the right file on my computer, Maschine 3 shows the VST in the preferences BUT impossible to see it when you want to select it for a sound. See all the following images. Hope you'll help me, I'm getting depressed ahah.