. The iPad 2 is hardware-limited and cannot be updated past iOS 9.3.5. JustAnswer
If you are married to your iPad 2, here is the only workflow that works without daily frustration: whatsapp for ipad 2 ios 935 portable
If you require a local application, these methods are "portable" but technically complex and often unstable. : If you previously downloaded WhatsApp on a
: If you previously downloaded WhatsApp on a newer device using the same Apple ID, you can sometimes go to the "Purchased" tab in the iPad App Store and attempt to download it there. It may offer to download the "last compatible version," though even older versions may no longer connect to WhatsApp servers. 📵 The Hard Reality for iOS 9
However, if you're determined to use this vintage hardware, here is a breakdown of your current (and very limited) options. 📵 The Hard Reality for iOS 9.3.5