If you don't have the CD, you can manually download the driver from the official Brookstone website, as per the device's manual:
While the device works as a standard mouse immediately upon plugging it in, the scanning functionality requires specialized software to function. This software enables: brookstone scanner mouse software download
Mac OS X 10.6 (Snow Leopard) through 10.9 (Mavericks). If you don't have the CD, you can
Follow these steps to ensure the mouse and scanner functions sync perfectly with your computer: If you don't have the CD