Youtube downloading is not supported anymore.
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Tap on the Voot icon to open the Voot website. Search for the video/episode/movie that you want to download and tap on the one you want to download.
You will see a blue color download button embedded on all the videos.Tap on the download button of the video that you want to download.
You can then choose the resolution in which you want to download the videos and start your downloads.
Once resolution is selected a dialog appears which allows you to change your download location.
You can tap on the download icon on the top of the screen to view your downloads. Or you can check them in the notification panel.