There is no "Whatsspy Public APK" / Where to download "WhatsSpy Public APK"?
There is no mobile application (APK) for Android for this project.
This is because this is a pure proof of concept tech demo to prove that this flaw can be used to 24/7 mass surveillance any phonenumber that uses WhatsApp.
Please do not ask for APK or "A Mobile App". As stated on the main page, this is a Proof of Concept and not a handy tool for anyone to use. There will never be a mobile application made by the creator of WhatsSpy Public and current applications in the store seem to be a scam, beware!