Payment is one time or recursive & Personal & Developer License

I'm going to purchase "https://flatlogic.com/templates/react-material-ui-admin-node-js". So I have some questions. 1. Payment of theme is one time or yearly or monthly etc. 2. Theme will be used for only one project. Butt this web app will be used by many our clients, by change in color or logos etc. Then can I use personal license,