Before installing, you must allow your phone to install apps from outside the Play Store: Go to > Security (or Lock Screen and Security ).
If your phone cannot be updated past Android 4.4.2, the ultimate solution is moving to a modern device. You do not need an expensive flagship; even entry-level budget phones or modern feature phones running KaiOS run the official, secure version of WhatsApp effortlessly. How to Rescue Your Old WhatsApp Data whatsapp apk for android 4.4.2
While WhatsApp is no longer supported on Android 4.4.2, it is important to understand why this change was necessary for your security and to keep up with technological progress. Before installing, you must allow your phone to
Corrupted cache or incompatible data from a previous installation. Fix: How to Rescue Your Old WhatsApp Data While
Using your phone’s browser (Chrome or Firefox—make sure they are updated for KitKat), navigate to a trusted APK site.