Rockstar Games (the publisher of Max Payne 3) uses activation servers and online verification. Offline key generators simply do not work with modern DRM like Rockstar Social Club. Even if a tool claims to work, it either injects malicious code or is a hoax.

: Running an executable from an unknown source to "crack" a game can lead to your personal data being compromised or your system being locked by hackers. Common Max Payne 3 Activation Fixes

If the game asks for a code you don't have or says it's "already in use":

Aviso importante: Discontinuidad Symphony

Los dermógrafos y módulos Symphony ya no se fabrican y quedan disponibles solo hasta agotar existencias. 

Garantizamos reparaciones durante los próximos 4 años. Te ofrecemos un plan RENOVE especial para actualizar tu equipo, manteniendo la compatibilidad con módulos superiores y asegurando todos tus servicios actuales de micropigmentación y MESO.