Why hasn't Presonus fixed this software glitch for the Artist to Professional upgrade? This has been around for quite some time apparently.
New Users must search until they sift through this Blog to find a solution and that's provided they know how to find this after spending much time with Offline Activations, contacting the reseller about the inoperable (but in the end) proper key code, etc.
Hope this image helps those stuck in this mode. The post by Wildomar is valid, this is just an added screen capture so you visualize what you're looking for.