I just updated my HTML Help Builder to version 5.21 using Chocolaty. The first thing I normally do after an update, is to check What's new. However, in this case I find that the help file that comes with version 5.21 refers to version 5.15, and says "not released yet".

I also found that the web version is not updated, it refers to 5.17, https://helpbuilder.west-wind.com/docs/_3n50mk9s0.htm.

Yikes, the online docs are outdated by a bunch - there have been 2 interim releases. I've updated the docs.

FWIW, you're not missing anything new in the docs - there haven't been any updates beyond the readme file. 😃