When you install an app on your Shopify store, you grant it permission to access specific information related to your store.
The app may require additional permissions to support new features when they are introduced. To see if this is the case with your particular installation of the app, access the App Preferences and look at the top right hand corner for an Update app button.
Click on it if it is present and step through the wizard to authorize the additional permissions. If the button isn't present, then your installation of the app is up-to-date and all of the app's features are available.