: These are meant to be merged directly into the game's root directory. 3. Installation Steps
: These are patch files for Ragnarok Online servers. File: COS_RO2_DLC.rar ...
: Copy your game’s original folder before moving any new files. : These are meant to be merged directly
: Drag the extracted files into the main game folder. If prompted to "Overwrite existing files," select Yes (this is usually required for mods/DLC to work). File: COS_RO2_DLC.rar ...
Knowing the internal file extensions (like .pkg, .txt, or .data) would help me give you more exact steps.
Look inside the extracted folder to see what kind of files you have: