A licence for Cubase 9 is also valid for everything from SX1 (and maybe before), it is just that your old PC does not know the C9 licence yet and need a licence database update. Run maintenance in LCC on the old computer.
A licence for Cubase 9 is also valid for everything from SX1 (and maybe before), it is just that your old PC does not know the C9 licence yet and need a licence database update. Run maintenance in LCC on the old computer.