Hi.
Terry Here.
I released all of the Super Packs for Ship Simulator 2008, so perhaps I can help. When you download any of the super packs, select to "run" or "install" the file (the exact wording depends upon your browser).
Accept all the defaults (just keep clicking "OK") and when the process has finished, you will find that Red Jet has been updated and that in your "Custom Missions" folder, there are a number of new missions.
If you still have problems, send me a private message and I'll talk you through it all. You'll be amazed at how simple it is once you've done it.