I was just wondering if this driver only works for Windows, or can I use it with the Mac OS?
No, this won't work with Mac, because it has been created to work only with Windows operating systems. However, there is a way to download a Mac OS X driver using the link posted below. Access the page and scroll down to see the Mac OS X category, then you can download the necessary package.
Download page: https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx