Hey there Tami! I had this issue as well. There's two ways to solve this:
If you have studio one artist, prime, or producer already follow these steps:
1.) Open Studio One 5
You don't have to install a new edition of studio one 5, but if you already have run the installer more than once in your problem solving it won't be an issue. You can activate studio one professional within studio one itself.
2.) In the top left, click Studio One
Should be to the right of the soundcloud/macro icons
3.) Locate the activation button and click it
This should pull up a page with options, I'm not looking at studio one as I'm writing this but I remember an "Activate With Presonus Sphere" option. Click that.
4.) Restart studio one if it doesn't force restart on it's own.
Once it reloads you should see the new professional logo underneath studio one.
5.) Download presonus sphere extensions and samples:
You can navigate back to the studio one tab (top left of the start page in studio one) and click manage downloads (or something of this kind) and then create a custom download from your purchased items from presonus.
If you don't have a previous version of studio one, follow these steps:
1.) Go to my.presonus.com
Login to the presonus account you used to purchase presonus sphere. Go to the products tab in the bar at the top of the page, it should then switch you to the presonus sphere interface. Once you arrive at the presonus sphere page (where your name should be displayed) scroll down until you see an icon for Studio One 5 Professional.
2.) Download the presonus sphere edition of studio one 5
To the right side of the rectangular icon you should see a presonus sphere logo and a download icon. Rather than clicking the download icon to the right of the presonus sphere logo, click the presonus sphere logo. It should then download the installer for the Presonus Sphere edition of Studio One Professional, solving the common issue of not having a product key or license number to activate an outright version of studio one 5.
3.) Activate via presonus sphere
Once you've followed the on screen instructions within the installer and launched studio one via shortcut or the program file found in your (C:) drive, activate by entering your email and password. (use the Presonus Sphere option to activate.) You should be good at this point and be able to start downloading all your libraries and extensions.
Finally, rub your eyes and your head from all that problem solving and information, then make some music!