Hi MatthewSCC,
Welcome to the forum,
As TJK said, if you have downloaded and installed the other version of QuestViewer, you will have to remove SS from your computer and re-install it.
After you have registered your serial key in your forum profile, you should read this topic:
http://80.95.161.114/shipsim/forum/index.php/topic,17722.0.html (http://80.95.161.114/shipsim/forum/index.php/topic,17722.0.html)
Regards,
Marty