Unzip the contents into C:\My Documents

Cut and paste Dm-Cybrosis.unr into C:\Unreal\Maps
Cut and paste Dm-Letting.unr into C:\Unreal\Maps
Cut and paste Dm-Loxi.unr into C:\Unreal\Maps
Cut and paste Dm-Mojo.unr into C:\Unreal\Maps
Cut and paste Dm-Shrapnel.unr into C:\Unreal\Maps
Cut and paste Dm-Twilight.unr into C:\Unreal\Maps