Not free!

Thanks for your review.

One thing: The donation is not mandatory to use this plugin. You just need to add billing information in Google Console, it’s required by Google from July 16, 2018.

For your reference: https://developers.google.com/maps/documentation/javascript/error-messages?utm_source=maps_js&utm_medium=degraded&utm_campaign=billing#api-key-and-billing-errors

I am ready to help you if are unable to install or having any issues with the plugin.