Unable to extract jwplayer playlist

[oldergod]

$ youtube-dl -U
youtube-dl is up-to-date (2020.09.20)
$ youtube-dl -f bestvideo+bestaudio https://archive.org/details/threads_201712 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestvideo+bestaudio', 'https://archive.org/details/threads_201712', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.09.20
[debug] Python version 3.8.3 (CPython) - macOS-10.15.7-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.2.3, ffprobe 4.2.3, rtmpdump 2.4
[debug] Proxy map: {}
[archive.org] threads_201712: Downloading webpage
ERROR: Unable to extract jwplayer playlist; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 532, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/archiveorg.py", line 43, in _real_extract
    jwplayer_playlist = self._parse_json(self._search_regex(
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1010, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract jwplayer playlist; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.