For the most current and detailed information, especially regarding any potential tools or mods for unlocking DLCs, I recommend checking the official CK2 forums, Paradox Interactive's support pages, or community discussions.
Before modifying any files, create a backup of your game files to prevent data loss. ck2 all dlc unlocker
: The most popular "smoke and mirrors" tool that tricks Steam into thinking you own the DLC. For the most current and detailed information, especially
Because Paradox games often include the actual DLC data files within the standard game updates, these tools work by tricking the game's launcher and executable into believing you own the licenses for them. How DLC Unlockers Work Paradox Interactive's support pages