If you try to download videos, you must know how much problems you face for download. There is no website as i know, give the opportunity to direct download. You have to use different downloader for different sites. It is not helpful, it create many problems. Largest video site youtube use youtube downloader but sometimes it didn't work.
Now i am given you a software information which will help you. It's downloadhelper, click this link. See and follow the instructions. I hope it really helpful for you.
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