While there is no official version 4.4.4 of the YouTube for Android TV app (the current official versions are in the 6.x range), the number 4.4.4 is often associated with the older Android KitKat 4.4.4 operating system.

, which was one of the final versions to natively support the Android 4.4+ architecture. Sites like

If you value stability over bleeding-edge experiments (like "AI Comment Summaries"), you should block updates via ADB commands after installing version 444.

If you're having trouble getting the app to run or look right on your TV, this guide shows you how to manually adjust settings for better results: