At this stage we assume you have already activated at least your free version of the plugin.
Go to WooCommerce > Order & Inventory Manager. Next go to the Pricing tab in the plugin top menu.
Select the version you want to upgrade to.
You can choose to pay Monthly, Annually or a one time “Lifetime” fee. You also have the option to use the plugin on 1, 3 or 10 sites.
After selecting a price plan, you will be sent to the payment section. Choose you preferred payment option and fill out all necessary fields followed by clicking the “Review Order” button. A summary of your order will be visible. Check all necessary check boxes and hit the “Pay & Subscribe” button.
Your license is now upgraded but your plugin might still need to be upgraded as well. Download the new plugin from the link in the top or from the account page and install it the same way you installed the free version. The free version of the plugin will be deactivated automatically when you activate the new plugin.