Platinum contains both Express and Gold.
Express will shrink and burn DL discs.
Gold will NOT shrink but will split to 2 discs or burn DL
If you installed Platinum, you should have an Express and a Gold Icon on your desktop unless you choose not to creat Desktop icons. Either way both programs should be installed in program files. Make sure that you downloaded Platinum as there are separate downloads of Express & Gold, but you need the Platinum to take advanage of both programs with a Platinum Key.