thanks for replying. I just redownloaded the file to verify what you said. The installation guide refers to the Getting Started Guide I'm guessing(?). The 3.5 Getting Started Guide does not say anything about the image apart from the fact a .tar.gz image is needed.
Then, trying to unpack the .bin in Mac didn't completely work out (by default macos actually wants to make an archive file out of that). I tried it in my Windows VM with 7-zip. All I end up with is a .raw file and nothing else.
The download might be flawed if what you say should be the case.