Plugin updates are fully integrated into WordPress. This means, that all updates are directly visible in your WordPress updates screen and work just like any other update.
Simply click on the “View version … details” link, to see a list of all changes and hit the “update now” button to download and install the update automatically.
Please make sure that you have entered your license key and see the “Active License” label in the plugin description. When you did not enter your license key or your license expired, you might not be able to update the plugin.