Use a mobile browser in "Desktop Site" mode (may be very slow).
Given that support has officially ended, you might encounter several issues. Here is what they mean and what you can try: Descargar Whatsapp Para Version De Android 4.4.2
A: Meta (WhatsApp's parent company) does this to ensure the app remains secure and can incorporate new features like advanced encryption. Older operating systems cannot receive the necessary security updates to support modern apps. Use a mobile browser in "Desktop Site" mode