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.