Moreover, you have to add & use your own Envato API Token to get working the plugin/script. Please review the provided documentation to get the instruction or follow the steps below. Check out the screenshot as reference http://prntscr.com/hnhy2a
If you added the Envato API Token, then upload the plugin/script on your hosting server. This is because, the plugin/script only works on an online server, because it’s works based on an online API (Envato API) and doesn’t work directly on local computer without a server.