This package includes the Kingston PCREAD-USB-CF Card Reader Driver for Mac OS. Once the download is complete, double-click the installation file and follow the instructions provided in order to update your drivers.
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.