Auto-translated
Heh. It seems the solution is simple: the Lua script file contains a path description: Maps/Multiplayer/Kampf der Helden/. And the name of the folder with the map inside the map archive is Maps/Multiplayer/Kampf der Helden 1/. I corrected the folder name, and when the game starts, a message appears in German gibberish, which wasn't there before. This means the scripts have connected; now I'll check what happens next.
I checked, and everything started working.