I don’t know anything about mac’s . but I know Steinbergs registering process has become complicated lately and it’s not very straight forward imho comparing since I first used the dongle in 2004. the good news I guess is that the dongle will not be needed in the near future so I wouldn’t put too much money into any USB converters. I am sure there is a solution out there for what works and not, if you can’t read the dongle and you have your dongle and product registered in the mysteinberg I would assume this is your problem as mentioned