While this tool makes it easy to download content from Youtube, I do not endorse the theft of content created by hardworking citizens of the Internet. If you use Youtube as a primary source of entertainment, then please remember to turn off ad-block, buy their merchandise, or donate to the content creators you love to watch. And if you can't do that then simply like, comment, and subscribe to help them get more people enjoying their content.
Just clone this repository. You should know what to do with it... else you don't deserve it. 
It's easy buddy.
1: npm install
2: npm start or node index.js