When I go into the software and log in, I put my new serial number in. Then it says I need to put in the serial number of the software I'm upgrading. The artist version does not show up on the list. Probably because this a v4 software, and artist is v1 software. I copy and paste the Artist serial number from my my.presonus account into the correct location and try to activate. It then says "This upgrade needs to be processed on my.presonus.com." Then I go to my.presonus.com and click, "Register a Product." I enter the serial number. It says, "You need to supply the product key for the software you want to upgrade." But there is nowhere to enter the old product key. I thought it would find the Artist version automatically or have an option beside Artist to upgrade and enter my new upgrade serial number. In my account I have demo versions of various previous versions of Pro as well as a full version of Artist 1. When I purchased the upgrade, it said from "all versions of Artist." So, here I sit.