I don't know. Epic always did make things a lot more complicated than
ID and Valve, in both their directory structure and console commands.
It sounds like you have the maps in the right place. Are you trying
to play them offline or online?
This was found in the Epic forums:
"It would be nice to have something official as to where to place
custom content, I've gone through all the mutators in beta and final,
all maps in beta and final, and no one seems to be totally in
agreement as to where to place things.
So far, this is what I'm using, and it seems to be working , but
again, it would be nice to have something official from epic.
mutator .u files go User\Documents\My Games\Unreal Tournament 3\UTGame
\Published\CookedPC\Script
mutator .upk files go User\Documents\My Games\Unreal Tournament
3\UTGame\CookedPC
mutator .ini files go User\Documents\My Games\Unreal Tournament
3\UTGame\Config
weapons .u files go User\Documents\My Games\Unreal Tournament 3\UTGame
\Published\CookedPC\Script
weapons .upk files go User\Documents\My Games\Unreal Tournament
3\UTGame\CookedPC\Weapons
weapons .ini files go User\Documents\My Games\Unreal Tournament
3\UTGame\Config
all map files go (map .ini, .ut3, .upk)
User\Documents\My Games\Unreal Tournament 3\UTGame\Published\CookedPC
\CustomMaps"
>> Stay informed about: UT3: How to play downloaded maps??