You are already a Premium Member? - Our Platinum, Gold and Silver Packages offer you more information.
Your membership will be changed to the desired package as soon as possible after your upgrade request. You will receive an invoice within the next few days. You only pay the difference to your current membership and the current price of your desired membership. The duration of your membership does not change.
A ZMP employee will inform you promptly. For further questions please do not hesitate to contact us.
Current prices & information can be found here.