- Purchase the edition that you'd like to upgrade to
- Login to your WordPress site and go to Plugins page
- Deactivate your current edition
- Install and activate you the edition you purchased
- Under plugin settings menu, go to Licenses page, enter your license key and click activate button. Make sure it says "Valid"
- Enjoy your plugin
Please note that you can not activate a different edition of the same plugin on the same WordPress installation.