I followed the procedure about superchannel and it was enabled.
I can't seem to find a way on the online shop to buy the superchannel add-on on its own.
There is only a check-box when buying a new license.
When you say that keys cannot be upgraded i know it means i can't go from lvl 4 to lvl 5 by paying the difference, but does it also mean i can't use superchannel without obtaining a new license?