Let's find out a couple of things:
1. Which folder that you see RVFOREST.DAT file in your SD card (do you see it in WIISAVES/RUUP?). So you need to make sure the "dlcsetting.xml" contains the right path/folder name for that RVFOREST.DAT file.
2. Which messages that you saw when you run DiiLC, after you had pushed button A to start the process for DLC, did you see something like processing us region, then jp region, then eu region, and finally kr region with message like the following:
"Processing kr region: Setting up..., Downloading..., Decrypting..., Pete..., Wendell"?
If it is a successful run you also should see "Saving buffer to savegame file" message at the end (with OK).