Once you have the APK file, follow this checklist for a smooth install on Android 4.4.2:
Facebook Lite for Android 4.4.2 (KitKat) Facebook Lite remains a critical tool for maintaining social connectivity on legacy hardware like Android 4.4.2 (KitKat) facebook lite android 4.4.2
Do not worry. Here is the safest method to get compatible version. Once you have the APK file, follow this