Mawthra: "standalone" is the default in the Kalanyr release, so you don't *have* to add that if you're using that (see attached)
I actually had misinterpreted that. I only want to install downloaders, not patches... But I'll need of course the DLC installers. And I do get extras. I'll have to look in the params again.
This is GOG's fault (though, with lots of extra enhancements gogrepo could do it): There's a lot of duplication. Like Witcher 3 + Witcher 3 GOTY having the same many gigs of extras. Or "bundled" games also having duplicates of extras.