Dead TOC Links
Guys, you're mixing up HTML bookmarks and straight links, but I think I can help fix it so your TOC samples actually download. :)
Instead of:
<p><a id="toc1" href="https://github.com/realpython/about/raw/master/toc/RealPythonPart1-TOC.pdf">
Why not just skip the dead links and use your chapter-summary id's? You could get things going like bookmarks, and it SHOULD send you over to that very nice GH reader copy.
<p><a href="https://github.com/realpython/about/raw/master/toc/RealPythonPart1-TOC.pdf#chapter-summary"> NOTE: Update numbers for PDFs and chapter-summary calls where relevant.
I hope this helps -- I spotted the problem while I was poking around trying to figure out what I'd get if I bought your course. Looks like I learned something already! Thanks for your time.