I don't think you can.
Graphics, new ships, and missions. I do find that if you are running a slower computer that Ship Simulator 2006 will run fine, but even on my brand-new laptop, Ship Sim 2008 runs a little slow when I get into the waves.
Ship Simulator happened in 2006.
Ship Simulator was created on 2007-07-13.
Ship Simulator Professional was created on 2007-03-23.
where can i download ship simulator 2006 full version for free
short answer "NO"
no
Probably
You can get the code by buying it.
It's illegal.
At most video game stores that sell PC games.