SP 4.05 can be downloaded from the official Space Shuttle Mission simulator web site. Like in the past, the Service Pack is free for registered users.
The Space Shuttle Mission 2007™ Simulator is available for online purchase in downloadable format at the SSM2007 official web site: www.space-shuttle-mission.com. The free demo can also be downloaded freely at the same web site.
Exciting Simulations ™ is an entertainment brand name of Simsquared Ltd. - a leading developer of professional Virtual Reality Simulation applications.
You can get the demo here.