Many plugins have more than one licence plan. If you wish to upgrade your licence to a higher plan in order to take advantage of its additional features, just to your Account page, click ‘View Licences’ against the product you wish to upgrade, and select the upgrade path.
Pro features not activating after upgrade
If you upgrade your licence but find that not all the Pro features are available, just deactivate then reactivate the licence. This should trigger the update.