Your chats will load within Safari. You can bookmark this page for easy access. Alternative Solutions for Legacy Devices
A common method for getting "unsupported" apps on older devices is jailbreaking. Because your iPad 2 runs iOS 9.3.5, it can be jailbroken using a tool called It's a "semi-untethered" jailbreak, which means it's temporary and you have to re-run the jailbreak every time you restart your iPad. whatsapp for ipad 2 ios 935 portable
