Its not working for me. During installation it didn't seem to take the extra time to extract the files. My copy of WC2 is MS-DOS/Macintosh and is not battlenet.

I ran it from the command line to see what it said:
[string "/usr/share/games/stratagus/wargus/scripts/s..."]:82: attempt to call global 'setFullGameName' (a nil value)

Is there a command line to extract the data? I previously had wargus working without the campaign and was hoping to get the missions by reinstalling with the file extraction happening locally.