Using npm:
npm install --global o2tv-dl
o2tv-dl is a command-line program that allows you to download your favorite series from O2TvSeries.com
o2tv-dl [options] <series>
-v, --version output the version number
-t, --timeout [timeout] how long can a request take (default: 60)
-f, --format [format] the video format (mp4, mp3, HD) (default: "mp4")
-h, --help output usage information