Step 1: Download the PRO version from the My account page. You will also find your license key there.
Step 2: Install and activate the PRO version on your WordPress site. How to install a WordPress plugin from a ZIP file?
Step 3: Druring the activation, you will be asked to enter your license key. Enter it and click Agree & Activate License:
If you didn’t activate the license during the plugin activation, you can always do it by clicking the Activate License link on your Plugins list:
After activating the PRO license, you will be able to check your license details, by navigating to the My Account page in your WordPress panel. The link is visible on the Plugins screen:
On the My Account page, you will find basic details of your license, including your name, email, and your license expiry: