Okay, so I've not tried to see whether this installs or even looked at the disc images, I'll be honest, but it is a legit 7z and I've included reports on its contents ̣— apparently the game and a Basilisk installer.
I guess I could unpack the archive (which I got from some website), if there are those who will not try this classic otherwise.
Again, I have not tried this, so if anyone out there would report whether it is a working copy or not, muchos gracías