Pluralsight protected by captcha

[shanyuen]

Yesterday i cannot download anymore.
I still can access via browser, but now the website protected by captcha.

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--no-check-certificate', '--write-sub', '--sk
ip-download', '--username', 'PRIVATE', '--password', 'PRIVATE', '--playlist-item
s', '1', '-o', '/%%(playlist)s/%%(chapter_number)s. %%(chapter)s/1. %%(title)s.%
%(ext)s', 'https://app.pluralsight.com/library/courses/designing-deploying-excha
nge-2016-70-345-transport']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2017.08.27.1
[debug] Python version 3.4.4 - Windows-2012ServerR2-6.3.9600
[debug] exe versions: none
[debug] Proxy map: {}
[pluralsight:course] designing-deploying-exchange-2016-70-345-transport: Downloa
ding course JSON
[pluralsight:course] designing-deploying-exchange-2016-70-345-transport: Downloa
ding JSON metadata
ERROR: Unable to download JSON metadata: HTTP Error 403: Forbidden (caused by HT
TPError()); please report this issue on https://yt-dl.org/bug . Make sure you ar
e using the latest version; type youtube-dl -U to update. Be sure to call yout
ube-dl with the --verbose flag and include its complete output.
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp_2hklmx2\bu
ild\youtube_dl\extractor\common.py", line 503, in _request_webpage
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp_2hklmx2\bu
ild\youtube_dl\YoutubeDL.py", line 2168, in urlopen
File "C:\Python\Python34\lib\urllib\request.py", line 470, in open
File "C:\Python\Python34\lib\urllib\request.py", line 580, in http_response
File "C:\Python\Python34\lib\urllib\request.py", line 508, in error
File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
File "C:\Python\Python34\lib\urllib\request.py", line 588, in http_error_defau
lt

[shanyuen]

Last week i meet with this problem, but 2 days ago it's work again.
I think pluralsight prevent account that doing non-stop download.
Then i tried to limit my download activity 6 hours per day and of course with 2 minutes per session.
I manually create download batch job with each single playlist item.