Download the DLC files for the game you own
Place the DLC files in the game’s title directory or the location Citron uses for installed content
Open Citron
Right-click the game in the library
Select the option for installing content or DLC if available
Choose the DLC file or folder and confirm installation
If Citron does not have an install option, copy the DLC into the correct content folder manually
Make sure the DLC version matches the game version
Refresh the game list or restart Citron
Launch the game and verify the DLC is recognized