Sorry.... just made up the .15 I guess...
probably because he jumped from v0.15 to v1.00 without adding any significant content (he claimed 1gb but I'm not sure where that came in).
The update numbering has become a bit muddled over the years. A lot of the updates are pretty small, just seeming bigger because you have to repeat scenes that occur maybe 1–2 times a week many times to advance. Rarely did I feel like it was a "full" update. These days it's more common to see those listed as a sub-update or something similar rather than say a jump from .11 to .12. We also had an update or two devoted to redoing the game for odd reasons, such as when he puts in the mom's story mode or whatever.
Then there is the 1.0 version, which, if I remember correctly, came out fairly soon after Patreon closed his site down for review. I think 1.0 was what he rushed out with work in progress and some hasty work in order to appease their demands, and what I'll cynically say was to get the money flowing again.
Then, there's the 1.1 "demo" which actually does have a fair amount of content in it compared to his past updates, but introduces some new gameplay elements (the skill or point system for Liza and maybe others) that I honestly hope to never see again. Although that may come in the form of there never being an update 1.2 or BBS Vista, or whatever he names the next update if he ever makes one.