Ab macOS 10.9 is factory-installed by Apple Driver "locking out" ie the required driver is installed but can not be used.
The macOS Helper fixes this condition until Apple fixes this problem in a newer operating system version.
Note! The USB2DMX® interface is not yet plugged in to the USB port.
Start the macOS helper
→ Open With → Installer
Give her macOS User password on. → Install software
Info Wait for the installation to finish. This can take 1-2 minutes.
The installation is completed successfully → Close
Note! Be sure to reboot for the changes to take effect.
→ Apple → Restart
The macOS USB driver is now unlocked.
The USB2DMX interface can now be connected to the USB port.