Itch.io has several downloads; book 1, 2, and 3 are different downloads. You can download them straight from here.
These are the compete versions of Book 1 and 2, and the first Act and Act+ of Book 3 (the rest of Book 3 will be uploaded here as it's getting done). I wouldn't worry TOO much about the version number on Book 1; the steam build got some steam specific fixes after release (dealing with steam specific issues, like achievements); it was content complete at 1.0, and if anything was actually broken I'd upload another build here.