Can't download subtitles from www.udemy.com

[Bracer-tracer]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.07.30.1. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.07.30.1

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Youtube-dl can't download (parse) subtitles from some of the video on www.udemy.com, for example downloading subs from a free course: https://www.udemy.com/ip-subnetting/

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-v log:
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-u', 'PRIVATE', '-p', 'PRIVATE', '--write-sub
', '--convert-subs', 'srt', '-k', '-o', '..%(playlist)s\%(playlist_ind
ex)s - %(title)s.%(ext)s', 'https://www.udemy.com/ip-subnetting/']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2017.07.30.1
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-86809-g012620a, ffprobe N-86809-g012620a
[debug] Proxy map: {}
[udemy:course] Downloading login popup
[udemy:course] Logging in as login
[udemy:course] ip-subnetting: Downloading webpage
[udemy:course] 1056284: Downloading course curriculum
[download] Downloading playlist: The Complete IP Subnetting Course: Beginner to
Advanced!
[udemy:course] playlist The Complete IP Subnetting Course: Beginner to Advanced!
: Collected 60 video ids (downloading 60 of them)
[download] Downloading video 1 of 60
[udemy] Downloading login popup
[udemy] 6288972: Downloading webpage
[udemy] 6288972: Downloading lecture JSON
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'https://udemy-assets-on-demand2.udemy.com/2017-0
..../WebHD_720p.mp4?nva=..&token=..'
[download] Destination: ..\Video\The Complete IP Subnetting Course - Beginner to
Advanced!\01 - How To Get The Most Out Of This Course.mp4
[download] 100% of 2.57MiB in 00:02
[ffmpeg] There aren't any subtitles to convert
[download] Downloading video 2 of 60

...

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[rocxteady]

+1