Go to Settings > Security and toggle on Unknown Sources .
Verdict for Gamers & Streamers: If you need background playback, you cannot use vanilla YouTube. You will need (discontinued) or ReVanced patched for API 23, but that is an advanced topic. For standard viewing, stick with 17.36.37. youtube apk android 6.0 1
Leo tapped the familiar red-and-white icon, but instead of the homepage, he saw a cold, white screen. A message appeared: "Please switch to the website to use YouTube" . The official app had grown too big, leaving the old Marshmallow version behind in its pursuit of newer, shinier updates. Go to Settings > Security and toggle on Unknown Sources