Casio does not widely distribute a free, standalone fx-82MS emulator to the general public. Instead, they provide professional tools for educators:
This paper describes the design and implementation of an emulator for the Casio Fx-82MS scientific calculator. It recreates the device's numeric, function, and memory behavior, reproduces the original UI and input sequencing, and validates correctness against canonical calculator outputs. Casio Fx-82ms Emulator
You might ask: "Why not just use the calculator app on my phone or a free scientific calculator online?" Casio does not widely distribute a free, standalone
The answer lies in fidelity and training. and memory behavior