Hi Justine,
Thank you for your purchase.

Sorry to disappoint you but unfortunately something like this is not possible.

As we are using Envato as the marketplace for selling the product, their licensing policies apply: https://codecanyon.net/licenses/terms/regular

Their policy in general is: one license is per one domain or project.

If your multiple sites are sub-sites of the same domain, and apply to the same project, you can use one license.

If these are installed on different domains, and are different projects, you would need a separate license per each.

Best regards.

HI parpro,

Sure, when you are moving sites (live site from local or stage site) we can suggest to use Plugin Duplicator. 

We use it and it's working fine, because it will transfer all the files and also the tables to database. 

Best regards.