nelson, I'm not sure how that link is relevant. It deals with Windows activation, not PTE AV studio. It is a long article so maybe I missed something? Perhaps I should have been more specific about what I was attempting to upgrade.
I've been trying to upgrade from 10 Pro to 11 Pro but when I enter my 10 Pro key I receive an error message saying key is incorrect or damaged. I've tried multiple browsers all with the same results. Thoughts?