upgrade Parallels Desktop 12!

I have Parallels Desktop 12 Permanent license.
But now can't install on my mac because MacOS latest version not support .

How to upgrade Parallels Desktop 12 to Parallels Desktop 17 subscription version? (with old key upgrade.)

 

Hello kritteet, Please reply to us in a personal message with the email address to assist you further. Thanks.

 

Hello, i have already purchased an activation key for my free version and it seems that not work properly. Can I get a refund in order to buy the whole version? Thanks in advance. Pablo

 

Hello, please help us with your purchase reference number.

 

how i can contact to you?

 

Hello, we have pinged you in the personal message, please provide us with the email address or the purchase reference number to assist you further. Thanks.