Some older versions may eventually stop working if Facebook issues a "forced update" server-side, which prevents the app from connecting unless you move to a newer OS.
For Android 4.4.4 users, this means the final "supported" version of Messenger is no longer available on the official store. However, those older versions (specifically Messenger versions v108.0 through v127.0 ) still work remarkably well on KitKat. You just need to sideload them using an APK file. Facebook Messenger Apk For Android 4.4.4
Download the APK: Use your mobile browser to navigate to a trusted APK archive and download the specific version compatible with Android 4.4.4. Some older versions may eventually stop working if
Modern versions of Messenger require Android 5.0 (Lollipop) or higher. But don’t throw away that old phone yet. The final supported version of Messenger for Android 4.4.4 still works perfectly for text messaging, group chats, and even voice calls. You just need to sideload them using an APK file