Question: how to download all videos from youtube playlist using idm?
Answer:  Launch Your Web browser, Go to YouTube, get or copy the link (URL) of playlist to download.  Go to YouTube Multi Downloader.  On the top right, click on playlist.  A YouTube Playlist downloader will appear, select format for the download, For example mp4 360p, MP4 720p, MP3 1080p and other formats available.