Since you are downloading an APK file outside of the Google Play Store, you must give your phone permission to install it.
After you've downloaded the APK:
While installing the APK allows you to use the app, there are significant limitations to consider when using WhatsApp on Android 4.4.2 today: whatsapp for android 442 uptodown full
With WhatsApp installed:
If you need to keep using your old phone, consider these safer options. Since you are downloading an APK file outside
Uptodown is one of the safest and most popular open software distribution platforms. Unlike many shady third-party sites, Uptodown offers: whatsapp for android 442 uptodown full
