I'm using I4 with 4.2.1, jailbroken and unlocked with pwnge tool and ultrasnow 1.2.
I have installed Supreme Preference 3.0 1b8 but it wont load and when I click on the package in Cydia I see this error "files installed to /User", is there any fix?

Supreme Preferences 3.0 is intended to be used on iOS 3.x and I cannot see any indication that it has been updated to work with iOS 4.x. There are some reports of the base level functionality working on 4.0, 4.0.1, and 4.0.2, but I see no confirmed reports of it working on anything newer. Do you have any information that would illustrate otherwise? If not, it's likely that this (like some other software right now) has not yet been updated to work properly on iOS 4.1 / 4.2...