Creative Assembly and Valve (Steam) have anti-cheat and verification systems in place. Using an unlocker can lead to a permanent ban of your Steam account, causing you to lose access to your entire library.
The safest and most ethical way to enjoy the complete story and all the DLCs of Total War: Three Kingdoms is to purchase them directly from official channels like the game’s store page on platforms such as Steam or the official Sega website. This ensures not only access to the content but also support for the developers and protection against potential malware or account bans. total war three kingdoms dlc unlocker