Android 4.4.2 (KitKat) was released in 2013, and although it's an older version of the operating system, WhatsApp still supports it. However, it's essential to note that some features might not be available or might work differently on your device compared to newer Android versions.
If you insist on keeping WhatsApp on Android 4.4.2, follow this monthly routine: whatsapp for android 442
WhatsApp actively bans accounts that use unofficial, modified versions of their app. Android 4