Because of unexpected thing about releasing Longhorn Transformation Pack 4.0. There's some people who published Windows X's work before he release it himself which still in testing but news goes around so he have to release his imcomplete work.
This time Windows X have done it again with "real" complete by solved previous bugs, tuneup installing and minor changes about new wallpaper and more.
Download: Longhorn Transformation Pack 4.0 Refresh
News source: Longhorn Transformation Pack Home Page