I got the free DL from Steam this morning. I fired it up but couldn't figure out how to set it up for my 1920x1200 monitor. I ran at 1600x1200 but it wasn't very smooth. I'll have to look into how to run it on modern HW.
		
		
	 
What I did with Unreal Gold on mine (GOG version):-
1. Download the newest DirectX 10 renderer here and extract the contents of the "Unreal_266_Gold" folder into (Game Install Location)\System:-
http://kentie.net/article/d3d10drv/index.htm
2. Run the game and select DirectX10 (if you've already run it once and no longer get the first startup dialogue, then change the "Video Driver" under Options -> Prefs -> Video)
3. Select your resolution (1920x1080 was already shown as an in-game option on mine so I didn't need step 4)
4. If your resolution isn't shown in-game, quit and go into game install folder\System folder then edit Unreal.ini and change the relevant lines to:-
[WinDrv.WindowsClient]
FullscreenViewportX=1920
FullscreenViewportY=1200
5. If you're using a 120Hz or higher monitor, then whilst you're still in Unreal.ini, remove the 100fps cap by raising:-
FPSLimit=100
More advice here including HD texture packs / skins, etc:-
https://pcgamingwiki.com/wiki/Unreal