Thanx for telling us. This has already been brought up on the developers mailing-list. Unfortunately windows is not the system the developers work on, so it may take a few days or even until .22 to fix this.
I happen to be on my windows computer, and it looks like they just left the .map files out of the zip. I just rebuilt it with the files in their proper place, edited the hyperlink in the wiki, and am waiting on my slow internet connection to finish uploading the file.
please see http://globulation2.org/wiki/Talk:Download_and_Install as something has gone wrong and i reverted.
please don't link to not tested downloads. the link was broken! better windows\users get no campaign than no game at all.