Hello, I just recently purchased a 2011 Macbook Air 11" and 13" from my Grandma (were my Grandpa's but he passed away). I just ran out to Best Buy and bought the Thunderbolt to Ethernet adapter so I can connect my Air to our network at work, but it is not displaying in the Network settings. I am currently running Yosemite. I did some searching, both in this forum, Google, and Apple's community but didn't find a fix. I did find this post on Apple's community..... https://discussions.apple.com/thread/4030496?start=0&tstart=0 I did check my System Report - shows 'Thunderbolt: No hardware was found.' I did find some info on the Thunderbolt driver update 1.2.1 but looks like that only works with 10.7.4. So do I need to roll back, install the updated driver, then reinstall Yosemite? It won't be a big deal now as I don't have much on it....though it will suck. Appreciate any help.