Google Product Forums
Re: Is there an update for Style Builder?
LayOut has definitely been updated since version 2 (that comes with SU 7).
My latest StyleBuilder (as of November 26) is 2.0.11752
Both LO and SB are always bundled with the main (Pro) SU download however. So if you installed SU Pro, they must be somewhere there. Look for SB in this directory:
C:\Program Files\Google\Google SketchUp 8\Style Builder
If there is no such directory, you must have installed the Free version. What does it say on its title bar?