Assume the url of Youtube video is as following:

Just add ‘gen’ word before ‘youtube’ word of the video url. The mentioned video above should be like this:

The benefit of this method of downloading youtube video is that it provides multi selections of downloading the video.

It provided downloading different video qualities and sound qualities. Also the files sizes also previewed.

Here is a screenshot of the download page:

I hope this helps! 🙂