What is meant by "Site Only"? / LaTeX files?

[therogoc]

This webpage has PDF and LaTeX files linked:

https://borisbabic.com/teaching/inseadqm/home/index.html

I like to download the page with the linked files for my own use.

1. Is the "Site Only" crawl mode with "Download all resources" really the correct approach? The documentation is confusing in regard to domain and URL.

2. The linked LaTeX files are incorrectly saved with an HTML file. How to download them correctly?