While the functionality is vital, the search term "free download" comes with caveats. Users hunting for APKs for Android 4.4.2 must be vigilant.
: Go to Settings > Security on your device and check the box for "Unknown Sources" to allow APK installations outside the Play Store.
I understand you're looking for a Facebook Messenger APK compatible with Android 4.4.2 (KitKat), possibly from a source like "Deep Paper" (which isn't a standard or recommended APK repository).
: Go to Settings > Security on your device and check the box for "Unknown Sources" to allow installation of apps outside the Play Store.
For this guide, we use as the primary source.