There is very easy way to resume your you tube video which you are downloading . If you are downloading any video using IDM and due to some reason your net is disconnected . After that open your IDM and right click on video you were downloading , then click refresh download address . Then IDM will show wating for the link. After that open the page from where you have downloaded this video , and again click on download , when you will click on download IDM will start downloading the file from where it has stopped.
Screenshot is in below video.......
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Screenshot is in below video.......
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