First off, click the download link! Then click Open.

When the download is finished, it should come up with all the files that you downloaded in WinZip.

Extract these to C:\Program Files\LucasArts\Star Wars Battlefront II\GameData\addon. If there is no addon folder, create one there.

Check the addon folder and there should be a folder with a three letter name. If the folder is called something that is not a three letter name, open it up and there should be a three letter name folder inside. Move this into addon.

Run the game! The map will show up in Instant Action and Multiplayer as the three letter name with a couple of #'s and %'s if you have version 1.0 of the game. Map name will be normal for 1.1 users.