youtube-dl is a command-line program to download videos from YouTube.com and a few more sites. It requires the Python interpreter, version 2.6, 2.7, ... Youtube-dl.plugin.zsh · Youtube_dl/utils.py · Youtube_dl/extractor/common.py
Remember youtube-dl requires Python version 2.6, 2.7, or 3.2+ to work except for Windows exe. Windows exe requires Microsoft Visual C++ 2010 Service Pack 1 ...