It is highly recommended to always use the most recent driver version available.
Try to set a system restore point before installing a device driver. This will help if you installed an incorrect or mismatched driver. Problems can arise when your hardware device is too old or not supported any longer.

Is DDJ-SZ displayed on left side of window? Status of DDJ-SZ. After connecting the DDJ-SZ to Mac, How is the USB A or B Button LED and USB connection indicator LED? If DDJ-SZ is successfully connected to Mac, USB A or B button LED (Green) and USB connection indicator LED (Orange) is lit. Installation of macOS Sierra. Select Pioneer DDJ-SZ Driver and click Uninstall/Change. Operate by following the instructions that appear on the screen. When the system prompts you for the administrator password or for confirmation, enter the password or provide the confirmation information. Double-click the DDJ-SZ Uninstaller.app uninstaller to launch.

Pioneer Ddj Sz Driver Mac