purchased wrong version (upgrade not full)

I have a question. I have in my purchase history, parallel version 15. I do not have that currently installed on my newest mac. Do I need to already have an older copy of parallels installed in order for the upgrade to work? Or do I need to purchase the full version since I can't install my old permanently licensed version 15 on my current computer? I tried to reinstall the legacy version of parallels, but that didn't work, so I'm not sure if I should purchase the upgrade or the full version.

 

Hello, we have sent you a private message. Please help us with your Parallels Desktop for Mac license key over there so that we can check this further. Thanks.

 

Hello, we have sent you a private message. Please help us with your Parallels Desktop for Mac license key over there so that we can check this further. Thanks.

 

Hello, we have sent you a private message. Please help us with your Parallels Desktop for Mac license key over there so that we can check this further. Thanks.

 

I bought the upgrade for 69.99 euros and I whant a refund due to not having a licence.

 

Hi Parrallel Team, I purchased the upgrade version following a trial version. When entering the authorisation key it's asking me to enter the previous auth key which I never got with the trial version!!! HELP! Having gone through responses here and seeing that people got refunded, I have gone ahead to purchase the actual one. Please help refund the payment for the upgrade

 

Greetings Parallels Team, I have accidentally purchased the upgrade instead of the full license. Could I please get a refund?
my key is 400703995

 

Hello parallel team. I have accidentally purchased the "Upgrade" version of your product instead of the one I intended. Is it possible for me to get a refund?