The user might be trying to find a way to legally obtain the game. Perhaps they want to play it on their PC but the physical copy they found has a key that isn't working, which can happen if the key was already used. Or maybe they want to run the game on modern operating systems. There's also the aspect of emulators or compatibility layers to run old PC games. Maybe suggest checking the system requirements and using a virtual machine or dosbox or similar to get the game running.