Version 20 is the most advanced one because is the one from the Patreon version. It has a few more illustrations but also different endings which are still not yet illustrated.
For now is onhold and I can't really say when I'm gonna get back to it. I plan fo finish first Secret Glory Hole, which is a short game that happens few years before Pact with a Witch and I plan to seel it on Steam and see how it goes. ^^
Thanks for the interest.