I am now using the BluRay image which contains Spyder and its dependencies, so I am fine. But obviously there is a problem with the current algo being used if the dependencies of a software end up in an ISO but not the software actually depending on them.
I remember being surprised by the size of the ISO being significantly less than 16 GB. I believe it was 14.8 GB. I just downloaded it again to verify and voila : 14,8 Gio (15 909 054 464) Well...also known as : 15,9 GB

