You will need to create a folder on the root level of your hard drive titled BFD. You will then need to install your expansion pack into that folder. Once its installed, open BFD 2, open the preferences page (the checkbox icon at the top of the plugin) and create a new data path. You will then select the folder titled BFD. Press the button that says "Trash and rebuild all databases". At this point you will need to authorize your library. To use the kits in BFD 2, navigate to the 'preset' menu and select 'load kit'. At this point you will select the kit from your expansion library that you want to load. These will be located on 'your hard drive':\BFD\Kits.