Step 01: To get the license key please go to your account page Orders-> View and follow the below screenshots
Step 02: To Register your theme after purchase go to Dashboard> Register[itemname]> Enter your purchase key and then click on the Verify Now button.
This new setup allows for a faster, more reliable, and secure setup. Registration is required to receive automatic updates, and download demos and premium plugins.
For more details please check this: EnvyTheme Theme License Information