Everyone watches videos on youtube.We all want to download it .
So the shotest method discovered by me is just type "ss" in the place of  "www."

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You will be welcome on a new page.
Choose the format of the video .
And your video started downloading
  

Want to use android apps on your pc or mac.
Not to worry now you can do it by using BLUESTACKS.
Yes you can download it and can enjoy using android apps.