Here is the timeline:
Why? Because newer versions of Messenger rely on modern libraries for end-to-end encryption, video calling effects, and background data optimization that simply do not exist on KitKat. facebook messenger for android 4.4.2
If upgrading is not an option, the mbasic.facebook.com workaround is your most reliable, future-proof solution. Here is the timeline: Why
KitKat includes developer options to keep the system nimble: Go to > About Phone . Tap Build Number seven times to unlock Developer Options. Go back to Settings > Developer Options . video calling effects
Go to Settings > Security and check the box for Unknown Sources to allow the installation of APK files downloaded from outside the Play Store.