Can upgrade to SpinnerChief 4 ? If I buy SpinnerChief 3 Ultimate one time

If I buy SpinnerChief 3 Ultimate one time, I can use SpinnerChief4 paid version ?

If you are SpinnerChief 3 ultimate user, you will be upgraded to SpinnerChief 4 Ultimate version freely.

Can i do upgrade now ?

If you are SpinnerChief 3 ultimate user, you will be upgraded to SpinnerChief 4 Ultimate version freely. Please check the below link:

http://license.domarketup.com/license/upgradetosc4.aspx

Download SpinnerChief 4 in whitehatbox app directly.

By the way, please read the information carefully when you decide to upgrade it. if there is any problem, please feel free to have a contact with us. Thanks

But I can't remember my Serial Number

What was your payment email please?

please send your payment/Paypal email to [email protected]

our support will check it and then help you asap. thanks

Now, I send email to [email protected]

But don't have support answer :(

please wait for a moment, we are checking it now, sorry for the inconvenience.

OK :
Thanks Aprilcaicai for Answer :)

Why I input my payment/paypal email in http://license.domarketup.com/license/upgradetosc4.aspx

It's say

The serial number is invalid, please input right serial code.