1. Navigate to the Preset Menu by clicking on the name of the preset which is currently loaded. 

2. Locate and click the 'SCAN' button on your instrument.

3. Double-click the '---SCAN---.nka' at the top of the Preset Menu. 

4. After the scan, your Preset Menu will be up to date with all your factory, expansion, and user presets.

For a full overview on how to download and install Expansion Packs, check out this Knowledge Base article.