Right-click Unlock DLC.zip and select "Extract All" or use a tool like 7-Zip/WinRAR to extract the contents to a folder.
Open the Unlock DLC.dlc file using JDownloader. Unlock DLC.zip
Knowing this will help me guide you to the specific files or settings you need to change. Right-click Unlock DLC
Click the three dots next to the game > Manage > Installation Epic Games Help . Unlock DLC.zip