As of August 1, 2009, the most current version of the SCORM Engine is now 2009.1. During the term of your agreement with Rustici Software, most SCORM Engine customers are entitled to upgrades. Please create a ticket here or by sending an email to firstname.lastname@example.org if you would like us to provide to you the current version of the SCORM Engine.
For more details, check out the release notes and the upgrade notes. Note that each version of the SCORM Engine requires upgrading to the prior version first. Users of 2006.1 cannot jump directly to 2009.1.