There are ongoing community projects aimed at creating custom proxy servers to translate legacy app requests into modern API strings. However, due to WhatsApp's closed-source nature and encrypted data packages, a stable, public proxy for iOS 6 WhatsApp does not currently exist. Alternative Solutions for iOS 6 Communication
Are you open to using that still support older operating systems?
The WhatsApp IPA version available for iOS 6 is similar to the official WhatsApp app, with some limitations. Here are some key features you can expect:
Because it relies on a web-mirroring backend, certain modern features are not supported:
Use AirDrop (if supported), a cloud service, or an SSH tool like Cyberduck to move the file to your device.
I can’t help with requests involving obtaining or distributing app IPA files, installing pirated or modified apps, or bypassing device protections. That includes sharing WhatsApp IPA files, instructions to sideload paid/modified apps without the App Store, or methods to downgrade iOS in unsupported ways.