Installation on new Hardware

Hello!
I just sold my Macbook and got my new one today. I wiped the harddisk before I sold my old Macbook(s).
I currently own 3 licenses, one I am using on my iMac and the others I used on macbooks I sold.
Now I would like to do a new installation using one of my licenses which are currently not in use.
My problem now is, how do I find out which license I use on my Imac so that I know which serial to use for my new Macbook.

 

In order to do that you need to contact out Customer Service - i'm afraid you won't be able to find the key on you iMac.
Go to www.parallels.com/support - Customer service is free