It was a silly thing – found out, that I have to push the stick unnaturally strong into the usb-slot. It’s not ready if you’re feeling/hearing the first click sound… you have to push again. Maybe this helps other Macbook Users and they can save all the research I’ve done yesterday.
Anyway I found out, my Tacx Bushido isn’t new enough to use it with Zwift. So I ordered a 2016 Taxc Vortex. Hope with this move, everything will work properly.
Thanks for helping me anyway – can’t wait to go for the first ride with Zwift.