I assume they turned it off intentionally: "These notes may be compiled into a pdf file through Quarto. As the result is rather large, we do not provide that f

I assume they turned it off intentionally: "These notes may be compiled into a pdf file through Quarto. As the result is rather large, we do not provide that file for download. For the interested reader, downloading the repository, instantiating the environment, and running quarto to render to pdf in the quarto subdirectory should produce that file (after some time)."