If the "Resources" folder is missing, then create this folder in the "Custom" folder. I.e., the "MapPack001.rez" and "MapPack002.rez" files should be in both the main game's folder and in the "Resources" folder.
If the "Resources" folder is missing, then create this folder in the "Custom" folder. I.e., the "MapPack001.rez" and "MapPack002.rez" files should be in both the main game's folder and in the "Resources" folder.