To activate Airy YouTube Downloader , you must enter the unique code received via email after purchasing a license. Follow the steps below for your specific operating system. 1. Standard Activation Steps Launch Airy : Open the application on your Windows or Mac computer. Access Activation Menu "I have an Activation code" from the main menu. : Go to the and select "I have an Activation Code" Enter Your Code : Paste your activation code into the field that appears. "Activate"