Move pro version plugin from one website to another

I’m rebuilding our brewery website and currently purchased the event calendar pro and it’s on our existing website (been using the calendar for the past 6 months.) I’m going to migrate the new site over to root directly and wanted to know how I can re-use the plugin on the new website build. Obviously I won’t be using this on two sites since the existing site will be going away. Does anyone know if this can be accomplished?