Enable "Unknown Sources" on your Android TV (Settings > Security & Restrictions). Step 2: Install a file manager (like X-plore or Send Files to TV) via USB or Play Store. Step 3: Download the APK from a reputable mirror (APKMirror is the gold standard). Search for "YouTube for Android TV 2.18.53 armv7a." Step 4: Open the file manager, click the APK, and install.

Since you can't use the Play Store, follow these steps to "side-load" the app:

The correct solution—and the one that pains the digital archaeologist to admit—is to abandon the native OS. Buy an external streaming device. The TV’s screen is still glorious. Its speakers still boom. But its brain is no longer welcome in Google’s kingdom.

An older, specialized build of YouTube—often called YouTube for Android TV (Leanback) —was designed specifically for Android 4.4.4. This version still works, provided you download the correct APK.

YouTube 14.38.53 (arm-v7a) (nodpi) (Android 4.4+) - APKMirror

You have the latest version of YouTube for your Android 4.4.4 TV. But how long will it work?