I just bought a Samsung Galaxy Tab A and I want YouTube Vanced on the tablet. But it won't let me install it because it's an "unknown" app. Yes, I have enabled "unknown sources" and it still won't let me install the app.

A side note it's not blocking only YouTube vanced, it's blocking all unknown apps.

What can I do to get around this?

Here's a screenshot of the message:


  • 2
    If you bought a pre-owned device, the device may be enterprise/work managed, see View policies your admin is enforcing on your device Check under Settings > Security & location for Managed or any indication that the device is under management. – Morrison Chang Feb 5 '19 at 5:25
  • @MorrisonChang can't be... I bought this tablet brand new from Wal-Mart – Sal Feb 5 '19 at 6:23
  • I also checked and it doesn't seem the tablet is being managed... Another thing to note though is that Google play itself seems to be blocking the installation because when I see all the tabs it says Google Play – Sal Feb 5 '19 at 6:26
  • Are you able to side-load install F-Droid. Just wondering if Google is testing ways of blocking YouTube Vanced as it gets around their ads. – Morrison Chang Feb 5 '19 at 6:44

I turned off Play Protect & went to Settings > Security > More Security Options and cleared the credentials and was able to successfully install YouTube vanced and other apps!

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