My course that is purchased can't download now... previously i downloaded courses in udemy using youtube--dl but now it is impossible even with new update .. following is the error

[ADHIKARI1]

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'-u', u'PRIVATE', u'-p', u'PRIVATE', u'https://www.udemy.com/ultimate-guide-to-social-media-web-development-integration/learn/v4/content']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2018.02.11
[debug] Python version 2.7.13 (CPython) - Windows-10-10.0.16299
[debug] exe versions: none
[debug] Proxy map: {}
[udemy:course] Downloading login popup
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; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
File "c:\python27\lib\site-packages\youtube_dl\extractor\common.py", line 519, in _request_webpage
return self._downloader.urlopen(url_or_request)
File "c:\python27\lib\site-packages\youtube_dl\YoutubeDL.py", line 2199, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "c:\python27\lib\urllib2.py", line 435, in open
response = meth(req, response)
File "c:\python27\lib\urllib2.py", line 548, in http_response
'http', request, response, code, msg, hdrs)
File "c:\python27\lib\urllib2.py", line 473, in error
return self._call_chain(*args)
File "c:\python27\lib\urllib2.py", line 407, in _call_chain
result = func(*args)
File "c:\python27\lib\urllib2.py", line 556, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)