You cannot install the very latest WhatsApp (e.g., v2.24.x.x) because it targets Android 5.0+ APIs. You need a version that bridges the gap—recent enough to connect to servers, but old enough to install on KitKat.
The (2.24.9.73 as of May 2026) is a stable, secure, but feature-limited build. It allows you to continue messaging and calling for the remainder of 2026. whatsapp latest version android 4.4.4
This is the real fix: