Description of problem:
I tried to install the build 20130529 and it seems it has some problems with dependencies (there is a red error message saying something about problem with selected software). But if I try to change the selection and the go back to the main screen the button "begin installation" is active until the dependency check doesn't finish so I clicked it and it died later because of wrong dependency (which was expected). So I think the button shouldn't be active until the dependency check is finished.