Eventually, Facebook may update their servers in a way that prevents very old versions of the app from connecting at all. đź’ˇ Pro Tip: The Browser Workaround
Since you cannot use the Play Store, you must "sideload" the application. Follow these steps to do so safely: facebook messenger for android 4.4 2 apk
Older versions of apps do not receive security patches. Your login credentials and data could be more at risk. Eventually, Facebook may update their servers in a