cannot activate Parallels 17 (the key from the previous edition needed)

Hi, when I want to activate my Parallels 17 it shows that "you have entered an upgrade key. Please confirm it with a key from the previous edition". I have no idea why it's an upgrade key since this is the first time I buy your product. I need some help, please.

 

Hello, did you use the Parallels Desktop before?
If not you need a full license key.

 

We can provide you with a refund for your Parallels Desktop Upgrade license and you will be able to purchase the correct version