Click the “16” above the clear button to switch to hex and enter the number you want to convert (like 0x2008 from the example). An easy way to do that is to run Calculator and hit Command-3. We need to convert the hex numbers to decimal. Note the Product ID and Vendor ID (circled in red). Select USB and scroll until you find your Prolific USB device. Click on Apple -> About This Mac and and click System Report. The driver will need them so that it can be associated with your USB device. Here’s the URL at the time of this writing:
Browser to the Prolific site to download the driver and install it.