YouTube is major source to find and watch any kind of videos. In the previous post, I have discussed how to download YouTube Videos individually using IDM and IDA. In this post I am going to show you how to download YouTube playlist videos all at once using IDM (Internet Download Manager) or IDA(Internet Download Accelerator) or any other download manager. Especially this trick is useful to download lectures and tutorials which are available on YouTube. Downloading each video individually from a playlist is a time taking process and a big process.