You have the 8.5 Pro and bought the UPGRADE from 10.5 Artist → 10.5 Pro.
What you should have bought was the UPDATE from 8.5 Pro → 10.5 Pro
You have the 8.5 Pro and bought the UPGRADE from 10.5 Artist → 10.5 Pro.
What you should have bought was the UPDATE from 8.5 Pro → 10.5 Pro