Use a tool like Cydia Impactor or 3uTools to install the file onto your phone. Important Caveats and Limitations
Install a tweak such as to allow unsigned app installation.
To help find the best workaround for your specific device, let me know:
Install this specific version on your computer so you can access the App Store.
To track current compatibility baselines directly from the source, check the Official WhatsApp Help Center. Methods to Download WhatsApp Old Versions for iOS
Note: This method will install the highest possible version that ran on iOS 7, but you may still encounter server verification blocks upon opening the app. Method 2: Sideloading the WhatsApp IPA File via Jailbreak
Change these values to match the current version number of WhatsApp available on the modern App Store.
(Note: I can summarize steps to check App Store purchases or outline how to restore an encrypted iTunes backup if you want.)
There she was. The profile picture was a bit blurry now, low resolution by today's standards, but it was her. The timestamp on their last conversation: November 12, 2016 .
What are you using? (iPhone 4, iPhone 4S, iPad?) Do you have access to a Mac or Windows computer ? Is your device currently jailbroken ?