It is highly unlikely that you will be able to successfully run WhatsApp version 2.3.6 on an iOS device today. WhatsApp version is extremely old, dating back to roughly
32-bit vs. 64-bit Architecture
WhatsApp 2.3.6 was built for 32-bit processors (iPhone 5 and earlier). Apple dropped 32-bit support entirely with iOS 11. Even if you sideload the IPA file, iOS will refuse to run it.
- Most are fake or malware.
- Many require sketchy profile installations that compromise your Apple ID.
- Even if authentic, the app is dead on the server side.
Account Bans: Attempting to bypass version checks with modified files can sometimes trigger WhatsApp’s anti-spam systems, leading to a permanent phone number ban.