Steps:

1. Download the Massive Assault 2: Network game installer from "www.massiveassaultnetwork.com".
2. Install the Massive Assault 2: Network game.
3. Copy the following files from the Massive Assault 2: Network installation folder into your Massive Assault 2: Phantom Rennaissance directory. (Note: Do not overwrite existing files!).

.\data\ (not including subdirectories).
.\maps\
.\scenarios\NET\

4. Run the Massive Assault 2: Phantom Rennaissance game and go to the "World War" game mode. If the process was successful, you can observe that the new maps can be identified by their different style of map preview image.

5. Enjoy .

watsong, did you forget to correct the map names?

Now I have the correct picture for the most of added maps.


Nice pictures for Aurora and Demoland are missing from the official source.