It’s possible Upgrade Cubase 6 to Cubase 10 Artist ?
How do it?
I bought and downloaded upgrade Cubase 6 Artist to Cubase 10 Artist , successfully installed and now can’t upgrade Cubase 6 to Cubase 10 Artist 
Not trying to be a poo poo head here but, don’t be mad… before you received an answer to your OP you rolled the dice and lost.
Let us know how this gets fixed. Thanks.
Regards 