edit: hmmm, after looking at the finished download just now, i can see that it is only a few games that downloaded french and mac installers, i suspect some temporary snafu on the part of gog.
For some games, the extras contain original versions or extra games. For those there is no language or operating system selection. Example: alone in the dark 3.
While we're on that topic: I've run lgogdownloader --list-details on my collection and found NUL bytes in the output.
In my collection, this affects:
Alone in the Dark 1+2+3
Broken Sword 2
Dark Fall 2
For example, with Rune Classic, it looks like this:
For Alone in the Dark 1+2+3:
(similarly for all the other Alone in the Dark 3 installers for Mac+PC that are in the extras section)
Problem on the GOG side or bug in lgogdownloader (latest git)?