If you are attempting to recover old data or testing on a legacy device, you can find historical APKs on trusted archives: About supported devices | WhatsApp Help Center
You rely on voice/video calls, use WhatsApp for business, or handle sensitive conversations. In those cases, upgrade your device—a used Android 5.0 phone costs less than a dinner out.
Another well-known archive hosting historical app data. Step 3: Select the Correct Version