If you ever downloaded WhatsApp on any Apple ID, even years ago, follow these steps:
📁 – You’d need a backup from your own library or a trusted offline archive. We do not recommend third-party IPA sites for security reasons.
If you have on your Apple ID when it still supported iOS 9:
, and search for WhatsApp. If it appears, tapping the cloud icon might prompt you to download the "last compatible version" for your iOS. The Limitation: