Why do you always link to reuploaded files when you could just link to the official site that has the latest downloads and new instead?
[EDIT]
What kind of explanation do you need? Just copy nesDS.nds to the R4 along with the NES roms load it up choose the rom you want to play and enjoy.
[EDIT2]
Omg it has a rewind feature!!! If you hold L it will "rewind" until you let go allowing you to correct curtain mistakes you might have made.