http://ww2.nero.com/us/Update_Nero_Burning_ROM.html http://www.nero.com/us/updates.html Nero Burning Rom 5.5.10.20 serial number 5502-0034-7352-2566-3739-9135 or 5502-0774-7311-2411-2468-9628 or 5502-0358-6307-3892-6745-7228 or 5502-0021-2347-6669-4015-8212 or 5502-0639-3316-1919-3839-5652