In this regard, how do I install my new CAC reader? Step 4: Download and install CAC Enabler.Once you have your CAC reader, plug it into your Mac and ensure your computer recognizes it. Step 2: Plug in and Ensure It’s Accepted.Purchase a CAC reader that works for your Mac. Step 1: Purchase a Mac Friendly CAC Reader.How do I get my MacBook Air to read my SD card?.How do I know if my smart card reader is working?.