He needed a specific build. A version of YouTube from around 2014 or early 2015. Anything later than that would demand API levels that KitKat couldn't provide. Anything earlier might lack features or have security holes the size of a house.

Android 4.4.2 is now over a decade old. Even the YouTube APKs will eventually break because:

If you want reliability and speed on 4.4.2, YouTube Go is the undisputed top choice.

: Widely considered the most trusted source for genuine APKs. It hosts several 4.4+ compatible variants.