Hi! Thanks, glad you're excited about CraftStudio. It's a 10 years-old piece of software that I no longer actively maintain, so I wouldn't recommend investing too much in it... but it's still a lot of fun!
libbulletc is the native physics library, it might not be compatible with whatever architecture you're running? Like, could be some issue between 32 or 64-bit versions, or ARM vs x86? Or it might depend of some other library that your modern system is no longer shipping with... Linux builds were always a bit of a compatibility nightmare.
CraftStudio still works well on Windows as far as I can tell so that's a safer bet indeed...
I'm currently working on a new site and platform called JKLM.LAND which shares some inspiration with CraftStudio. It will allow making multiplayer-by-default games. If you're curious, you can follow the progress on my Twitter (I post in French atm but there's an auto-translate button) or our Discord.