If your phone has a pre-installed (system) version of YouTube, you may need to Disable it before the legacy APK will work correctly.
But don’t toss that tablet yet! While the official APK might be dead, there are still several ways to breathe life back into your screen. 1. The Reliable Workaround: Use a Browser youtube apk for android 4.4 2
folder, tap the APK file, and follow the prompts to install. Google Groups Recommended Alternatives If your phone has a pre-installed (system) version
: Primarily for TV boxes but known to work on some Android 4.2+ devices with ARMv7 chips. Finding & Installing the Last Official APK tap the APK file