Your official app is likely gone for good, but using a modern mobile browser or a third-party client like NewPipe Legacy will keep the videos rolling on your trusty KitKat device.
Try downloading an older version of the APK (e.g., v11.x) or perform a factory reset to clear out broken Google Services framework data.
Although it's technically possible to download and install APKs of apps for older versions of Android, this method poses significant risks, including exposure to outdated and possibly vulnerable versions of apps.
"Google has ended support for Android 4.4.2. Using old APKs is a security risk. You will not be able to use features like live chat, comments, or account switching. For security, avoid logging into your main Google account on these old builds if possible." youtube apk for android 4.4 2
Several independent developers maintain "Legacy" versions of YouTube clients specifically for older hardware.
: Android KitKat has not received security patches for many years, making it vulnerable to unpatched exploits if connected to the internet.
Google to Finally Drop Remaining Support for Android 4.4 KitKat Your official app is likely gone for good,
Another excellent open-source viewer that works on older devices. 3. Use the Browser (No Installation Needed)
To find the right solution, check the quick decision guide below:
You can still watch YouTube on your KitKat device. This guide covers the best working alternatives, APK downloads, and workarounds. Why the Official YouTube App No Longer Works "Google has ended support for Android 4
Utilizing the mobile web version of YouTube (m.youtube.com) can provide access to YouTube content without the need for a dedicated app.
Android 4.4 KitKat is truly dead, loses Play Services support - Ars Technica
Finding a YouTube APK for Android 4.4.2: Best Working Alternatives