Unlike Android (APK files), Apple does not allow public distribution of old IPA files. The official App Store only hosts the latest version. Apple’s code signing system prevents you from installing unsigned or outdated IPAs unless your device is jailbroken.
Some users report that manually changing the device date (e.g., to April 2025) in Settings > General > Date & Time can temporarily bypass the update prompt. Web-Based Clients: whatsapp 2.3.6 old version download ios