Open
Safari(
Firefox or
Chrome) to browse playlist of YouTube videos, there is
Download All button on the web page. If the video you are playing is in playlist, you will get
playlist option in drop down list of
Download button.
Click Download All button or Playlist , the following window pops up.
You can select the videos you want to download. Right click the video, you can arrange the videos according to the Name, Date, Length, Size, Popularity of the videos. And you can choose Ascending or Descending.
If there are more than 100 videos on the web page, you can click Show 100 more videos button to view more videos.
To set default resolution of downloading videos, you can select resolution in the drop down list of Desired of video quality.
Click Download button, the selected videos will be added to the Downloading list.