Downloading cracked files or executable scripts from untrusted forums frequently exposes your computer to trojans, ransomware, or crypto-miners.
For players interested in accessing all the content of Crusader Kings 2 without using a DLC Unlocker, there are several alternatives: crusader kings 2 dlc unlocker
Open the Crusader Kings II folder via Steam (Right-click CK2 in Steam > Manage > Browse local files). crusader kings 2 dlc unlocker