Red X'es?
The maps in this atlas are made using a variety of different styles which are provided with different products. If you see red X'es in the map you just downloaded, check out the 'Required Products' map note found in the downloaded map, it lists all the products you need to have installed to view that particular map properly. Note that these products can be either official ProFantasy add-ons, and/or the free community packs found in the forum.

Also note that some maps have additional resources provided with the map. These are included when you download the complete atlas, but if you download single maps, you also need to download any required map resources (if present), and put them in the correct folder.