If you meant "Ample Sound Riffer free" or "Strummer free" – those features are already included in the Lite versions above.
If you have the Free version (Ample Guitar M Lite II), here is how to access this feature: ample sound rectangles free
Once you obtain a serial code for the Lite version, open the License Manager, click "Activate," paste the code, and download the small sample library. If you meant "Ample Sound Riffer free" or