YouTube 14.43.55 is generally recognized as the last official stable release compatible with KitKat.
Only download these from verified repositories like APKMirror or Uptodown to avoid malware. 2. How to Fix "Update Required" or Server Errors
While newer versions won't install, you can still sideload the final versions of the app that were built for API 19 (Android 4.4+).
Using a (KitKat) has become increasingly difficult as Google officially dropped support for this version in July 2023 . Because Google Play Services are no longer updated for KitKat, the official app often fails to load videos or displays a "Update Required" message that cannot be bypassed.