For users with an iPhone 4s, iPhone 5, iPhone 5c, or similar, this is a complete dead end. This article outlines the reasons why and what viable alternative paths are available to you.
While there isn't a formal academic "paper" titled "WhatsApp IPA for iOS 9.3.5 Download," whatsapp ipa for ios 9.3.5 download
Trying to download WhatsApp IPA for iOS 9.3.5 is a method that will not be successful. WhatsApp officially ended support for all iOS 9 devices in 2021, and the last compatible version you could have installed is so outdated that it will no longer connect to WhatsApp's modern servers, regardless of how you install it. For users with an iPhone 4s, iPhone 5,
Install Telegram from the App Store. It will offer you the last compatible version automatically. Telegram offers secret chats, bots, and cloud sync – and it’s fully functional on iOS 9.3.5 as of 2024. WhatsApp officially ended support for all iOS 9
However, you can still install a compatible legacy version of WhatsApp (roughly version 2.18.x or older) by using an and a sideloading tool.
While a vintage iPhone like the 4s or 5 running iOS 9.3.5 holds a certain nostalgic charm, it is no longer a viable daily driver for modern messaging apps like WhatsApp. The app's support for iOS 9 ended back in 2021, and as of mid-2025, it requires iOS 15.1 or newer to function at all.
I can provide specific, step-by-step instructions based on your setup. Share public link