As I shared in a comment above, the book is released under a Creative Commons license that does not authorize sharing derived works so only the original author can distribute you an alternative version

However I vibe-coded this tool for my personal use with our good friend Claude: https://onetake-ai.github.io/html-ebooks/

Which when pointed at a repository containing an "html book", like https://github.com/yan7109/yan7109.github.io/tree/main/ma-bo...

will give you an ePub with all the content in one place.