The battlezone.zip file you have requested: Maps Levels Missions / Battle Zone - 7.93mb is not available. Perhaps try browsing all files for the game Halo 2 and upload any files you want to share or are missing. This is the only information we could locate:
When you get through downloading the maps, because it is in zip format you have to extract it.To do this, double click on the folder you downloaded, now you should see the maps, and the readme file. Click the button above them all that says, Here is a Halo 2 map made by SlatersFury.