When you start Parallels Desktop for Mac, click on Business Edition button to proceed to a license key registration.
Enter your activation key (dashes will be added automatically).
Once you enter the key, it will be validated. If the key is valid, it will be marked with a check mark.
If the key has been successfully validated, click Activate. If your Mac is connected to the Internet, Parallels Desktop Business Edition will be activated.
Note: An Internet connection is required for activation of Parallels Desktop Business Edition.
If the key is not valid, it will be marked with a red cross sign. Check to see if you entered the key correctly.