Look, I'm not planning on printing the whole thing, binding it and sticking it on my shelf. I want the pdf because then I can use it when I'm offline, across devices and search it easily.

If I want this book in hard copy, then I will purchase it - I've done this regularly with free digital books - but when it is offered free digitally then in my opinion prohibiting to only certain file formats is futile (as evidenced here), and such constraints are ineffective attempts to encourage people to buy the hard copy through inconvenience.

And I must add that this is no slight to the authors, whom have my greatest appreciation for compiling their vast knowledge into a book and offering it for free. These guys are legends.

@dandermotj I understand that, just included the reason why you cannot get it. The online book really sucks. I turned the styling off.

This type of thing is what gets people thinking about a way around the no-pdf solution.

What does the contract say about 3rd parties wrapping it in PDF?

I was able to print to PDF in Chrome and combined the PDFs in Acrobat.

I guess this could be automated. For instance, you could download all html files using a plugin like "Download Them All" with a renaming mask like "inum-nameinum.ext" and then try:

find . -iname '*.html' -exec wkhtmltopdf {} {}.pdf \;

There are also tools to convert the resulting files to a single pdf. The only problem I got is, that the woff fonts are not rendered by "wkhtmltopdf" :-/ Ideas?

you mean, like people have proposed multiple times already in this thread (with actual working scripts)

Who did before? Also, this solution would work with a newer release of wkhtmltopdf.