I need to make sure the response is helpful without promoting piracy. Let me structure the answer by addressing the illegality first, then offer legal alternatives. It's important to be clear and direct but also informative. Mentioning the official store, purchasing options, and possibly contacting customer support for lost keys would be good. I should avoid providing any keygen links or encouraging piracy. Also, highlight the risks of using unauthorized keygens, like malware or invalid product codes.