Original here: http://www.insanelymac.com/forum/topic/36848-how-to-convert-mac-demos-to-full-games/
http://www.macgamefiles.com/detail.php?item=18034
Obtain v3369 Patch and install to the demo folder (you will have to manually choose where to install patch to)
ut2004-macpatch3369-2.dmg.bz2