For all those confused about the naming convention of THESE AVNs (NOT major corporation/programing community/etc. standards) ... there isn't one.
The MOSTLY USED one is to only use a 1.x for finished content, but this isn't guaranteed.
Versions prior to said finished content usually correspond to updates, so 0.1 is the first release, 0.2 a second release, 0.2x or 0.2.x is an update to a second release, 0.12 is the 12th release prior to a finished version, etc. Some single games will be broken up into "Seasons" with each season being a separate program that needs to be loaded, and some just break up into 2 or 3 programs to reduce the file-size people have to download each time a new version is released, and those can come with a variety of numbering conventions, which are similar to what I talk about in the next paragraph:
If there's a Part 2 of a game after a Part 1, some Part 1's will be 1.x, and then the Part 2 will start with 2.1; others Part one might be .14 and part 2 might start with .15, yet others will finish Part 1 as 1.x and then Part 2 will be branded as a whole new game and start back at 0.1.
That's what you get when most of the people here are amateurs trying their hand at something for fun.
In the case of Bare Witness, there's going to be five chapters, each released as a new version, so there was 0.1, 0.2, 0.3, 0.4, and then chapter five will probably be 1.0 since it's supposed to be the end of the game (not actually sure if there were that many releases, but that's how the naming has been). All the "fixes" and "bug updates" have been letters after the numbers, so they've been consistent at least.
Anyway, that's my rant. Welcome to F95Zone.