Find a script for quickbms that matches your game’s DLC format (e.g., game_x_dlc.bms ).
Find the DLC file (e.g., expansion.dlc ) and the decryption key. On GOG, the key is often in a metadata.json file inside your account folder.
When you purchase DLC—say, an expansion pack for The Witcher 3 or a character for Street Fighter 6 —the files are often already present on your hard drive (downloaded via a patch). However, they are locked behind a layer of encryption. Your purchase gives you a small decryption key or a license file that tells the game: "It is okay to read these locked files now."
In the world of PC gaming, few abbreviations spark as much curiosity and controversy as DLC (Downloadable Content) and the process known as "DLC Decrypt." If you’ve ever downloaded a game from GOG, Steam, or the Epic Games Store, only to find that your premium expansion pack isn’t recognized, you’ve likely stumbled into the rabbit hole of encryption keys, license files, and DRM.