how to download youtube video in mobile or PC without software।।youtube video download (bengali) 

how to download all youtube video in mobile or PC without software??
This is very simple and easy way to download any software from youtube. For example- https://youtu.be/QXcEO1lv1uo
thank you for watching this video tutorial..
https://www.youtube.com/watch?v=VXXjNesWOJs
https://www.youtube.com/watch?v=TBMBXTutClE
https://www.youtube.com/watch?v=i7QyvCVZYek

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 https://www.youtube.com/watch?v=QXcEO1lv1uo