Download and install Parallels Toolbox for Mac.
Start Parallels Toolbox. You will see the registration window. You should either sign in to your existing account or create a new one.
After you sign in or create an account, your copy of Parallels Toolbox will be activated with a trial license for 7 days.
Once the trial period is over, you will lose access to most of the application tools until you purchase a license.
You can purchase the full version at any time during your trial period and reactivate your copy with it. Open the Parallels Toolbox application and click on Buy to make a purchase, or click I Have a Key if you have already purchased a license to activate the product.