For those without the purchase history, the internet is rife with sites offering "WhatsApp IPA for iOS 9.3.5 free download." These repositories archive older versions of apps.
Here is a deep dive into why this specific version of iOS is stranded, the reality of downloading legacy IPAs, and the technical workarounds that keep these vintage devices connected. whatsapp ipa for ios 9.3.5 download
Search for "WhatsApp 2.21.50.ipa" or "WhatsApp iOS 9.3.5 ipa." Some users have uploaded old encrypted backups. For those without the purchase history, the internet
This is the only legitimate way, though it rarely works for iOS 9 now. For those without the purchase history