on the Play Store. This is essentially a "donation key"—it unlocks a few non-critical features while the core engine remains free to download from the developer's official channels. Key Features of the Premium/Pro Version Support for Shizuku:
Even if you install a file called "Fde.ai Premium APK," the moment you ask a question, the app sends your fake credentials to the server. The server sees you are not a paying customer and refuses to serve premium responses. At best, you will get the free tier; at worst, the app will throw an "Authentication Error."