If your device cannot update, visit WhatsApp’s official website to download the APK. Only proceed if instructed by WhatsApp to avoid unofficial links.
If you are searching for a specific download link because you have an older phone, you must be aware of the current support requirements. android 23 6 whatsapp download link
While stories of "future software" are fun, clicking on links for "Android 23.6" in the real world is dangerous. Here is why you should be careful: If your device cannot update, visit WhatsApp’s official