USB elicenser upgrade

I have a USB license for Cubase 6 Education
I bought the upgrade to Cubase artiste 8.5
I cannot upgrade my USB license. Why?
Thanks for your help

almendra 1234

Probably you bought the wrong update. Such as, you bought the update from Cubase 6 Artist to Cubase Artist 8.5, but you need the one from Cubase 6 to Cubase 8 pro.