You have access to the software by being the registered owner of the 24.4.2, with Presonus. Attempt to register the mixer to your Presonus account. Presonus with tell you it's already registered to someone else, or let you register it as yours. If you are successful registering it in your account, the downloads are available to you for Capture and Universal Control. Getting a copy of Studio One Artist is something you'll have to talk or email Presonus support about. I don't remember how I got my copy.
Good luck