Hmm, I'm not that familiar with BeautifulSoup, but it appears to not properly be parsing the page, rather than a download / availability issue. Specifically, there's no content in the soup object ~line 150 and thus the list of content to parse and download is just [].

Will keep probing, but if anybody has experienced something similar and has a handy solution, I'd greatly appreciate the tip! (And I'm sure the author would appreciate a PR)