HeRO uses some updated visual effects for skills, since some are very pixelated or official servers such as kRO have improved versions of them. However, some might prefer the classic RO effects anyways, so I've put up the download up on mediafire for these.
Just extract the files to your RO folder's "data" folder, and log into the game, or close and reopen it if you were already ingame.
Download Link
Keep in mind that it's not allowed to use edited versions of these to give yourself an advantage others naturally won't have. So use them as is!
If there's any classic effect missing from the download link, let me know and I will try to add it if available.