: WhatsApp now requires iOS 15.1 or newer .
If you absolutely must use WhatsApp on a device like an iPhone 4, your best bet is searching for community-maintained "tweaks" on platforms like the LegacyJailbreak Reddit , though success is not guaranteed. that still support older iOS versions? About supported operating systems | WhatsApp Help Center whatsapp ipa for ios 712 extra quality
If you previously owned WhatsApp on that Apple ID, try downloading it from your Purchased list in the App Store. It may offer the "Last Compatible Version." : WhatsApp now requires iOS 15
If you are determined to use an older device, community-led forums like LegacyJailbreak on Reddit occasionally discuss tweaks for older iOS versions, but these are increasingly rare for WhatsApp due to its strict server-side requirements. About supported operating systems | WhatsApp Help Center
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To achieve "extra quality" performance, you be jailbroken. iOS 7.1.2 is famously jailbreakable with Pangu (for 64-bit) or p0sixspwn (for 32-bit). A stock iOS 7 device cannot run a modified IPA due to signature mismatches.