PRESONUS AudioBox Stereo Quick Start Manual page 14

3.2 Studio One: Installation and Authorization
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7. Click on the Activate Software button.
8. Enter the Activation Code you wrote down in Step 2.
9. Click on the Download License button.
10. A file called "Studio One 2 Artist.license" will be saved onto
your computer. You will need to copy this onto a piece of
removable media and transfer it onto the computer on which
you want to run Studio One Artist.
11. After installing Studio One Artist, launch the program, and the
Activate Studio One menu will appear.
12. Click on the Activate or Upgrade link to begin.