About the Coveo License
Coveo sends an email message entitled Coveo Enterprise Search License Information to the email address that was entered in the registration form for your organization. The message contains a Coveo Enterprise Search License Code.txt file attachment as well as links to download the CES installer.
After installing CES on the Master server, when you create a new index or convert an existing one, an empty Enter License Code page of the Administration Tool automatically appears where you must paste the Coveo license information (see Entering a New License Code).