First install uc browser 8.6 in your Android.
Then install mx player pro.
https://play.google.com/store/apps/details?id=com.mxtech.videoplayer.ad&hl=en
Then go to any mobile site in which videos are given but download link not given(works also streaming videos).
Now click on video and see what happen.
You get 2 option play and download.
Just press download.