Smiley's People, episode 3

[Twixtfanatic]

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On YouTube, I cannot download episode 3 of the BBC Television 6-part mini-series "Smiley's People." The other 5 episodes download with no difficulty. I believe the reason pertains to a brief explicit sexual scene in the episode at 40:51. I am able to watch the episode on YouTube. Here is the relevant console output. The console app is mate-terminal running under Linux Mint. I shortened the name of youtube-dl to y in this folder.

david@Achernar:~/Downloads/youtubedl/youtube-dl$ ./y https://www.youtube.com/watch?v=wZ3Ou-nlXzQ
[debug] System config: []
[debug] User config: [u'-o', u'~/Videos/youtube/youtube-dl/%(title)s.%(ext)s', u'-f', u'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best', u'-v', u'--abort-on-error', u'--sub-lang', u'en']
[debug] Custom config: []
[debug] Command-line args: [u'https://www.youtube.com/watch?v=wZ3Ou-nlXzQ']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.06.16.1
[debug] Python version 2.7.17 (CPython) - Linux-5.3.0-62-generic-x86_64-with-LinuxMint-19.3-tricia
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6
[debug] Proxy map: {}
[youtube] wZ3Ou-nlXzQ: Downloading webpage
ERROR: wZ3Ou-nlXzQ: YouTube said: Unable to extract video data
Traceback (most recent call last):
  File "./y/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "./y/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "./y/youtube_dl/extractor/youtube.py", line 1893, in _real_extract
    'YouTube said: %s' % unavailable_message, expected=True, video_id=video_id)
ExtractorError: wZ3Ou-nlXzQ: YouTube said: Unable to extract video data

Is there any way to get past the block that You Tube has placed on this video? I tried the workaround --prefer-insecure but that had no effect. Maybe the --referer option would help, but I don't know what URL to use.

Thank you for your attention. I would be glad to try to provide any additional information you request.