There is no official “DLC unlocker” for WWE 2K18 from 2K Games or Visual Concepts. Any third-party tool claiming to unlock DLC for free is typically a crack, a cheat engine table, or a modified DLL file. Using such tools violates the game’s End User License Agreement (EULA), may lead to online bans (if attempted on Steam with multiplayer features), and risks malware infection. The safest and only legitimate way to access DLC is to purchase the WWE 2K18 Deluxe Edition or the Season Pass on Steam (though the game and its DLC have been delisted from digital stores as of 2019 due to licensing expirations).
Many top unlockers are actually save editors. You download a "100% Complete Save File" that has the DLC flag enabled. wwe 2k18 dlc unlocker top
For PC users with the CODEX version, a "DLC Unlocker" tool is often included in repacks to activate all additional content automatically upon installation. This is typically a small file that modifies the game's initialization to recognize DLCs as "owned". There is no official “DLC unlocker” for WWE