Put all .ini files into
\My Documents\My Games\Unreal Tournament 3\UTGame\Config

Note that you might have a newer version of BTRamp.u that came with your
BunnyTrailsGame.zip, so you might want to keep it. If you don't have one use this one.
Put all (other) .u files into (create this folder if it does not exist):
\My Documents\My Games\Unreal Tournament 3\UTGame\Published\CookedPC\Script

Put all .pkg files into
\My Documents\My Games\Unreal Tournament 3\UTGame\Published\CookedPC

Put all .ut3 files into (create this folder if it does not exist):
\My Documents\My Games\Unreal Tournament 3\UTGame\Published\CookedPC\CustomMaps

To play these maps you need to install BunnyTrailsGame:
http://tamtemple.clanservers.com/BunnyTrailsGame.zip