You can purchase Furie & Elbe from the Shipyard.
You should be able to use the SuperPack for the bulk ship Selsey III because it is a new ship from a different VSTEP program.
All other packs simply modify files for existing ships on your computer. If you install a pack for a ship that you do not own, you will be asked for a serial key when you try to use that ship. However, there will be no way to enter it.