First you need to deactivate and delete the free version if you are using, Then Install the Pro Files sent to you in your email. Go to Plugins:- Add New and click on Upload button, after browsing the files sent to you. Just click on Install and it will install the plugin. Then you can activate it from the Same page or by going to the Plugins Page in the WordPress Dashboard. Once you have done that Our Plugin will ask for the Order ID and Purchase Key. Just add that from the email and activate it.