seems like it should be able to be used on the soft eLicenser. You may have to contact support.
I did and it turns out you can’t transfer a license from an USB-licenser to a soft-licenser, only the other way around. But … to give some praise to Steinberg customer support - not only did they inform me of the facts but, in view that I had just purchased (yet another) version of Cubase (in order to be dongle-less!), they graciously (and probably exceptionally) supplied me with a new activation code to enable me to use the mp3 license I already owned with the soft-licenser on the hard disk. So there … even though that item isn’t all that expensive, I thought it was gracious and a nice gesture - they’re not all that mean!