Even if you sideload the 2.3.6 IPA file, WhatsApp’s servers will immediately reject it. The app’s API has changed hundreds of times since 2012. Version 2.3.6 uses outdated security protocols, meaning you will see a permanent "Version Expired. Please update to continue" error.
Search for . If you have downloaded it before on that Apple ID, tap the Cloud icon to see if Apple offers a "last compatible version" for your specific iOS.
Support for versions under iOS 15.1 ended on May 5, 2025.
If you used WhatsApp 2.3.6 on your Apple ID back in 2013 , it might appear in your purchase history. On a very old device running iOS 6, you could go to App Store → Updates → Purchased → search for WhatsApp. Sometimes Apple allows you to download the last compatible version. However: