uh a theme??? the vista ultimate?? come on dude search.NOt to be a jerk but theres guides all over this place If you need help we need details, like firmware, wht u r trying to load theme with ex. customize1.2 customize 2.0, smb prefs. Am i suppose to read your mind. This is like me asking you ican you fix my car.
find it through the customize app, i would think. they were having trouble with it updating but i think that is resolved now. so try again. i would suggest useing SMB prefs. much easier atleast for me. ssh is so much simpler
Like scream said... you have to have Summerboard and Customize 2.0 installed on your phone. Then go into Customize and browse the themes and download the vista one you want (i think there are at least 5 or 6 by now)