Cubase 8.5 to 12 pro, already used access code on another user

Hey, i need help on upgrade cubase,
i had cubase 8.5 pro and i was upgrading to 12 pro and by accident i put the activation code on the wrong user on “Steinberg Download Assistant” ,
and now when i try to upgrade or put the activation access code on the right user he said that another user is using it.
on the other user that i was accidentally putting the wrong access code i have 10.5 pro and i didnt finish the update because i didnt want to upgrate this 10.5 cubase pro user.
i would love to get explanation and guide how to correct it all, thank u.

Hi and welcome to the forum,

Please get in contact with your local Steinberg support.