The latest version of Kefir is PR3. Included are a few bug fixes from PR1 though it may have a few bugs, and be a bit rough around the edges, but it works. It also comes with no documentation, although, it has a copy of Tepache's documentation, which can also be found mirrored on this site. The file is kefir-PR3.tar.gz

There are unfortunately no prepacked versions for any distros yet, although we'll be looking into that once we make the first proper release