Hi,
Subscription customer are automatically upgraded as the newer version of the products are released. This is one of the main benefits of being on subscription.
Volume license customers who own a license+ASA would get free upgrades for newer versions released during the validity of their Software Assurance Plan.
Customers with a valid perpetual license of Adobe eLearning Suite 6 or 6.1 can order the upgrade to Captivate 7 or Presenter 9 via adobe.com or a reseller.
Regards,
Sharad