Google is making significant changes to the Google Maps Platform, specifically how Google Maps API keys work. This will affect all clones using generated Google Maps API keys.
Starting June 11 you will need to enable Billing to use your generated Google Maps API keys inside clones. There’s a monthly free map usage allowance of $200, so you typically won’t end up paying but it still means that you’ll need to add credit card billing information to your Google Cloud Platform project.
Here the full blog post: https://mapsplatform.googleblog.com/2018/05/introducing-google-maps-platform.html
App Cloner 1.4.15 simplifies the generation/usage of Google Maps API keys in the sense that you can now generate a single API key for all your clones (see the App Cloner Settings page).
App Cloner 