Using an old WhatsApp version means . Avoid sensitive conversations if you must use it.
While it is possible to force WhatsApp to run on Android 4.4.2 by downloading an old APK, it is a temporary fix. For the best experience and security, it is highly recommended to upgrade to a device running Android 5.0 or higher. Whatsapp For Kitkat 4.4 2 Download Old Version
to your phone if downloaded on PC.