Downloading an Udemy course is not working - HTTPError()

[bogdansolga]

Downloading an Udemy course is no longer working. The command worked properly to download a few videos, but it suddenly stopped.

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--sleep=10', u'--cookies', u'./cookies.txt', u'https://www.udemy.com/the-complete-guide-to-angular-2', u'-o', u'/Volumes/Media/Video/Tech/Angular6/%(playlist)s/%(chapter_number)s. %(chapter)s/%(playlist_index)s. %(title)s.%(ext)s', u'--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.07.21
[debug] Python version 2.7.10 (CPython) - Darwin-17.7.0-x86_64-i386-64bit
[debug] exe versions: none
[debug] Proxy map: {}
[udemy:course] the-complete-guide-to-angular-2: Downloading webpage
ERROR: Unable to download webpage: HTTP Error 403: Unauthorized (caused by HTTPError()); 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.
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 599, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2211, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 437, in open
    response = meth(req, response)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 550, in http_response
    'http', request, response, code, msg, hdrs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 475, in error
    return self._call_chain(*args)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 558, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

[tfhavingfun]

Have the same issue.

[dstftw]

Most likely expired cookies.

[bogdansolga]

@dstftw: with all the respect, this is an incorrect assessment; using the same cookies, the download is retried, after several (4-5) further attempts.

I don't think it's a cookie issue, it seems to be some protection (against 'robots') from Udemy.