You must have already downloaded WhatsApp (any version) on this Apple ID in the past (e.g., on an older iPhone or a newer device).
Скачивание WhatsApp для мобильных устройств whatsapp for ios 10.3.3
Technology waits for no one, but with the right alternatives, you can extend the life of your classic iPhone for calls, texts, and music—just not for WhatsApp. You must have already downloaded WhatsApp (any version)