As per SSL 2/2+ 1st generation, the MKII interfaces will work with core audio on Mac (no driver required). On Windows, they will require the SSL USB ASIO/WDM audio driver, available from the SSL website. Please install SSL USB ASIO/WDM driver V5.58.07 Download or above. Previous versions of the ASIO/WDM driver will not recognise SSL 2/2+ MKII devices. This driver will work with the MKI devices.