This version looks like the classic iOS 6 app but loads the web interface inside. You must scan a QR code using a modern smartphone to link the accounts.
Simply installing these rarely works for messaging today; they are primarily for collectors wanting to see the app's original interface. Risks and Considerations using WhatsApp on iOS 6! whatsapp ipa ios 6 patched
If you find a modified IPA (such as WhatsAppX), you can sideload it onto your device using modern tools compatible with older firmware. Tools Needed: Sideloadly This version looks like the classic iOS 6