The Internet Archive is the gold standard for digital preservation. A search for "WhatsApp XAP" or "Windows Phone Apps" on Archive.org often yields results in the form of "Software" items.
The official support for WhatsApp on all Windows Phone operating systems ended on December 31, 2019 . While you may find archived download whatsapp xap file for windows phone
If you are archiving for historical purposes, only use community-vetted platforms dedicated specifically to Windows Phone preservation, where enthusiasts document file MD5 hashes to ensure authenticity. The Internet Archive is the gold standard for
: Search the forums for "WhatsApp XAP" to find threads where users have shared direct links to the final working version. While you may find archived If you are
: This is one of the most reliable archives, offering a direct download for archived XAP/APPX files for both Windows Phone 8.1 and Windows 10 Mobile.
You will likely get a "Server side error" when trying to verify your number. The servers reject old TLS protocols. So, you are doing this purely for the UI nostalgia or to keep the live tile flipping on your home screen.