It is a lightweight, open-source YouTube client. It does not use the official YouTube API, meaning it bypasses many of the restrictions that block old devices.
Many users find that even with the correct APK installed, the app may display a message stating "This version of YouTube is out of date" and force you to update, which your OS cannot do. How to Install the APK Manually Enable Unknown Sources: Go to your device and toggle on Unknown Sources to allow installation from outside the Play Store. Download the File: youtube apk for android 4.4 2