youtube-dl error when downloading videos from youtube 'urlopen error' solved

Instead of 

C:\Windows\system32> youtube-dl  -cio "E:/powerpoint_vba/%(title)s.%(ext)s" http
s://www.youtube.com/playlist?list=PLyKV-uDcp5XgJ8FqczLBf2XxKjmQUvcz6

we should use

C:\Windows\system32> youtube-dl --no-check-certificate  -cio "E:/powerpoint_vba/
%(title)s.%(ext)s" https://www.youtube.com/playlist?list=PLyKV-uDcp5XgJ8FqczLBf2
XxKjmQUvcz6

Source:https://github.com/ytdl-org/youtube-dl/issues/883