The download URL for ACE doesn't work and because my UT99 install is rather fresh, I can't play on any servers that have it. To test whether or not it was my game client not doing it's job, I manually typed the URL into my browser and got a 404 message, screenshot related. Maybe someone should fix the URL so that new players don't have issues connecting to games.
http://ompldr.org/vZXl3bA