If successful, WhatsApp will appear in your app list. But again, when you open it, you will see: "Your version of WhatsApp is no longer supported."
So, while you can technically download the file, you cannot register or send messages. whatsapp xap download link
Which of these would you like?
While the era has effectively ended, the file remains a symbol of the Windows Phone's unique history. For those looking to actually use WhatsApp today, the only viable options are modern Android or iOS devices, or the WhatsApp Desktop/Web clients. If successful, WhatsApp will appear in your app list