In order to use Mailcoach, you must buy a license. To buy a license you must register first. If you already have an account you can log in here to view your existing licenses.
Single domain licenses are valid for the installation of Mailcoach on a single domain or subdomain. In case you bought the unlimited domain license, there are no restrictions. A licence comes with one year of upgrades. If a license expires, you are still allowed to use Mailcoach, but you won't get any updates anymore.