Why don't you try tubemate. It's off the grid app. I can assure you it's pretty decent app even you can download any videos from any sites including Instagram. It was taken down from play store couple of years after the inception in 2012 , because they need to comply with Google , and Google won't allow to download YouTube videos just using an android app. This is my opinion, if I am wrong please kindly correct me with this comment.But still available for download from their website. Kaspersky, Avast, McAfee non of them found it has any Trojans or malware, And it's pretty fast downloader. It's a rare scenario if you get an advertisement displayed on your screen. http://tubemate.net/
