What are the license terms? Can I install the extension on a test server?
You can install the extension on any test/development/staging server associated with the live site you purchased the license for (the domain name entered during checkout). It doesn't matter if the URL of the test site is different to the live site - this is still covered under the main license.
Magento multi store set ups are covered by a single license. If the domains are not part of a Magento multi store set up, a separate license must be purchased for each domain. View the full Fooman End User License Agreement.