Specifically, the hunt for the "WhatsApp IPA for iOS 7.1.2."
If your device is jailbroken, you can try to trick the app into thinking it is a newer version: whatsapp ipa for ios 7.1.2
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Specifically, the hunt for the "WhatsApp IPA for iOS 7
Install this tweak from a reputable Cydia repository (like Karen's Repo) to allow the installation of unsigned or modified IPA files. whatsapp ipa for ios 7.1.2