The license is linked to your machine with product activation. But if you change the machine or its hardware parts, you will be able to contact support to move the license free of charge within 24 business hours. 

1. Submit a support request to move your license by creating a support ticket. In case of a multi-devices license, send us Hardware Id(s) of the machine(s) which you will no longer use with MZpack. See Where can I find Hardware Id of my machine?

2. After this don't run MZpack on that machine(s).

3. After receiving a confirmation from the support you will be able to activate MZpack on a new machine(s).