Package component (artwork) not found for layout generation

Hello, I'm currently using ADS 2014.01 for RF circuit simulation and layout generation for two-sided PCB.

One component I'm trying to use in my layout is SOT-25 package.

I find there is a chip component layout artwork that has many generic packages including SOT-25D, which I need to use.
(http://cp.literature.agilent.com/litweb/pdf/ads2008/layout/ads2008/SMT_Package_Layout_Artwork_Library.html)

However when I try to include the package's artwork for accurate layout generation, I only find other components like SOT23's (under ads_designs library) in ADS Component Library.

Please let me know how I can find other packages and use them in my layout.

Thank you in advance,
Harry

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