The plugin relies on the AfterShip service so it requires at least a free AfterShip plan to work. The plugin author is not affiliated with the AfterShip service in any way, for any matter regarding the subscription plans you have to eventually contact the AfterShip service.
The WooCommerce AfterShip plugin allows your customer to keep track of shippings through timelines displayed on the Orders details page! It is straightforward to use
Demo : https://codecanyon.net/item/woocommerce-aftership/23022935