You can also load cgz file with /importcube your cube maps placed in packages/cube.

Didn't know that. Always learning something new. :D

Did you even have the ogz?

When loading the map, just type /map, and then the first letter or two of the map name. Hit TAB and see if auto complete can find it ( you may have to cycle through. )

if you have problems just uninstall and redownload sauerbraten. dont worry, all your saved maps will still be there

NOT ON WINDOWS.