I made my way until the end ! At some stage, I opened a second project window to have circuit and surface at the same time. Although I saved project and device regulary, after a reboot of my PC, the device was missing features, while later features where there. Maybe I managed to mess this up by two project windows ? (Your hint at the second video, to make sure not to open a prior version was a perfect fit for my situation

Parameters section also gave me mystic moments, when "open" didn't open the little window on the upper left. Like in the video, the parameterwindow titles "uknow 007" at the beginning and changes to "equalizer" after reload.
As a summary, your video helped a lot, as SDK requires some clicks, which my personal logic wouldn't expect.
So 50% is the knowhow what to click, but 50% is the strategy to recover from unexpected situations.
It took me about 4 hours, as I often used the pictured button in VLC: