I'm not aware of such version :p If you mean the latest version on Steam, there's not much difference aside from chapter select.
Hmm my version naming for the demo must have been different from the full game. That demo must be old.
EDIT: Yep I checked, that demo is 5 years old.
The current version on itch.io (1.2.1) is the latest one, same on Steam. Do you have an old computer that can't run 64 bit?
EDIT 2: I have retrieved an older 1.0.6 version for Linux which should be more or less the same one as that demo and works with 32 bit Linux. I've uploaded it here.
2 years ago(+1)
Sorry, I can only put one version available on GOG, and I'm not going to put an early build. If you want an itch.io key to access the download I can give you one.
Just reach me to contact@cowcatgames.com