From what I’ve read Galaxy allows for downloading specific version of the games.

Might be misremembering, so take it with a pinch of salt

Edit: from https://www.reddit.com/r/linux_gaming/comments/1pxnkxj/so_for_people_who_says_we_dont_need_gog_galaxy/

It seems it’s mostly “proper cloud saving” that’s missing relative to Heroic 🤷

Surely they’ll make a native Linux client then, right, right?!

(Meanwhile; shoutout to Heroic)

Any particular reason you’re not on/tested the v590-branch? Of course it might be borked compared to 570, but might be worth a shot?

Why not just grab the previous PKGBUILD version that worked?