If you're trying to access DLC for (e.g., analyzing game files), consider using a clean, legally obtained copy and focus on trainers (infinite health/ammo) which are generally tolerated for single-player.
While Cheat Engine is a legitimate open-source tool used for memory editing (like giving yourself infinite health or ammo in single-player games), using it to unlock paid Downloadable Content (DLC) for free falls under digital piracy and software manipulation. far cry 6 dlc unlocker cheat engine