youtube-dl doesn't update in windows 10

[IoanPaleru]

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser
• Question

C:\Users\Computer User\Downloads>youtube-dl -v --update
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--update']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2018.12.03
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17763
[debug] exe versions: avconv 11.3, avprobe 11.3, ffmpeg N-83657-g7e4f32f, ffprobe N-83657-g7e4f32f
[debug] Proxy map: {}
Updating to version 2018.12.17 ...
Waiting for file handle to be closed ...

C:\Users\Computer User\Downloads>The system cannot find the file specified.
Updated youtube-dl to version 2018.12.17.
youtube-dl -v --version
2018.12.03

C:\Users\Computer User\Downloads>
...
<end of log>

Hi, it seems that when opening a command window, and typing "youtube-dl --update" to update youtube-dl in windows 10 pro, it says "The system cannot find the file specified.", and doesn't update youtube-dl.

I've already added the correct folder location for youtube-dl to the control panel, system, advanced system settings, environment variables, system variables, path, edit environment variable list as "C:\Program Files (x86)\Internet\youtube-dl and libav 11.3 files", and changed the security permissions for the "C:\Program Files (x86)\Internet\youtube-dl and libav 11.3 files" folder to allow full control for all users, so how do I get youtube-dl to update properly? Thanks.