We understand most of you develop on localhost – no problem with that.
Using a plugin like WPClone you’ll be able to play it nicely moving from dev to production and back. You just need to copy the whole database.
You shall be able to move your license transparently, as long as you clone appropriately your files and database.
If you can’t activate for some reason on your staging site, install & activate the plugin on your MAIN site, then sync the database from Production to the Staging site. You should be set.
If you’re encountering trouble on doing that procedure and need support, please open a ticket in the Support Board