To enter the license key, go to menu Help – About (or File menu – Account – About), and click the Enter Product key button. Insert the license key and click the Register button. Please note that if you purchased the Standard or Business Subscription for Project Plan 365 app, you don’t need a license key, just Sign In with your email and password inside Project Plan 365 app. The license key can be used only for local installed application on Mac and Windows devices.