Download a lightweight, security-updated browser that still supports Android 4.4 (such as Opera Mini or a legacy version of Kiwi Browser). Navigate to ://youtube.com .

Scroll down and tap (or Applications on some devices). Look for Unknown Sources . Check the box and tap OK on the warning prompt. Step 2: Download the Correct APK File

Fully functional on Android 4.4.2, blocks video ads, and lets you subscribe to channels without a Google login. The Simplest No-Install Workaround: Mobile Browser