Unfortunately I do not offer any demo versions however you can request full refund within 30 days from the time of purchase. No questions will be asked. If it does not work for you, I will truly appreciate to give at least some feedback but this is up to your consideration.
By purchasing AAM E-Commerce extension, you obtain the unique license that is allowed to be used only on one live domain however you can use it for unlimited number of development or testing websites as long as domain name is either localhost or starts with dev., staging., test. or demo. You can also transfer your license from one live domain to another while your license is still active. The instructions about license transfer are included in the email that you receive after purchase.