Older Android devices use either ARMv7 (32-bit) or ARMv6. WhatsApp after 2019 dropped ARMv6. If your device is from 2010–2012 with a single-core processor, it will not work. For Android 4.4.2, your device must have:
Even with the correct APK, you will encounter issues. Here’s how to solve them: whatsapp apk for android 442 work
If you manage to install a working version, here is what you can expect regarding features on the older OS: Older Android devices use either ARMv7 (32-bit) or ARMv6
If the "WhatsApp APK for Android 4.4.2 work" dream fails, here are three workable alternatives: Even with the correct APK, you will encounter issues