Oh, so about the edited saves thing.
Big Brother In Space just got updated and it was also updated to the newest version of Renpy, I tried editing a save file and now it won't load it either even if I say yes.
BBIS 0.6 has that savetoken.py file now too, that was added in Renpy 8.1.
So it doesn't seem like it was something the devs of this game intentionally added themselves as far as I can tell. Unless there was something else added on top of that which is keeping shared files from working at all.
If it's just that one thing then unaltered saves SHOULD work, I can't keep up has anyone tried that?