Hey I know where you can a free LEGIT copy! It's been legally released on ModDB as something called Unreal First Generation! download that and you will have a fully working game! (and a partially working copy of Unreal 1 too from what I hear.
Hell let me dig up a link really quick
http://www.strategyinformer.com/pc/unrealtournament/mod/43948.html+
Apparently this is released with epics permission and some other guy, It's weird but it works! it's a better alternative to the questionable download on UnrealKillers.com well mostly you have to be a member to download the damn thing on |uK|