SubSab, I tried but was not able to figure it out. It seems the older versions aren't available, even in 3rd party sites that make that sorta info available, but I could have missed something
I'm having the exact same issue (just in regular subnautica, I don't have below zero), I was pretty sure it was very playable when I last played it (2016 haha rip) and now I get like 5 fps, both in the main menu and in the game, even at the lowest s…