Google Takeout tool, data liberation service which Google created for users to download data from their Google services gets the support to download all videos uploaded by YouTube user. Till now YouTube allows to download transcoded videos from YouTube Video Manager, now your original videos you uploaded are available to download in Google Takeout.
Downloading Your YouTube videos with Google Takeout
All you need to do is visit YouTube Customized Google Takeout page and sign into it and click on “create archive” button to let the tool to start downloading videos originally done by you.
This may take more time depending on videos it need to download, check “email me when ready” so that you can stay away from system or continue to work where you receive email when videos download is finished, click “download” button and enter the password to complete the downloading of file to your computer.