Add/Remove Licenses: Salesforce Direct Customer/AdvoLogix AppExchange App User
When you install a licensed managed package in your organization from AppExchange, you purchase a certain number of licenses from the package developer or publisher. You can assign each license to a user within your organization. If you assign all available licenses, but would like to grant licenses to additional users, you can reassign a license or purchase more.
Users with a Checkout account can add licenses for your organization. If your organization doesnt have self-service access to Checkout, submit a request to your salesforce.com representative.
To add more licenses, you must create a quote using Checkout.
For more detailed instructions on creating a quote, see the Force.com help.