It's 1 chapter behind. We haven't published intermediate versions and, in fact, 0.4 is the second chapter and 6-7 hours of play, 0.6 is the third chapter and 10-13 hours. Now we are developing chapter 4 and we will publish it more often, 20-40 minutes of gameplay every few months
I see. I assumed they were by 0.1 version updates. Public is 0.4 while the others are 0.6.2 and 0.6.4. I thought that was more than 20 updates behind. My bad.