The screen Serial Number Validation appears when you launch a Creative Suite 6 product.
Creative Suite 6 products require an Internet connection for activation. The Serial Number Validation screen appears after your grace period and bonus launch have expired, and you still have not connected the product to the Internet. Ensure the following:
Computers that will never have an Internet connection must use the Offline Activation process to Activate. Store and volume license customers can use these steps. Volume license customers can also use the Adobe Application Manager Enterprise Edition for assisting with this workflow.
Complete this process for every offline computer that you want to activate. Make sure that you have access to a computer with Internet access to complete the steps below. Complete this process within a 72-hour period. If you cannot complete this process within 72 hours, contact Adobe Support for additional assistance.
Adobe Support can assist you with resolve Activation issues or to process an Offline Activation.