I just got an response from the seller with this link: media_build_u18.04.2_ker4.18_lib_201030.tar with his small note, download and install it.
I didn't got it to work jet. but i wanted to let you guys know. And maybe some of you got lucky.
Edit: he is also send me an install guide. CompilingTunersDriverForLinux_v1.2
I have tried that, on my pi with ubuntu and an old laptop x86 ubuntu but I still run in to the same error for both of them...