From the top bar, select '', then 'Restart'.From the top bar, select 'Utilities' and then 'Terminal'.Let go, and wait for your computer to boot into recovery mode. As soon as the screen goes black, hold down 'Command' and 'R' until you see a black screen with an Apple logo and a white progress bar. Steps to get your adapter working if you just upgraded to Mac OS 10.11 El Capitan. You're doing this on your own, and I assume no liability or warranty for what you do. Open your terminal, and run sudo nvram boot-args='kext-dev-mode=1'As with all advice on the internet, you can't sue me if this sets fire to your cat or sends ninjas to your house.Download and install the drivers from the CD, kindly uploaded by this fine human being.Steps to get your adapter working on Mac OS 10.10 Yosemite They won't understand, but they will forgive you. Apologize to the people you care about for the things you've said over the past few hours.Hit the + button in the bottom right, select the 'USB 2.0 10/100M Ethernet Adapter', and hit add.Open System Preferences, and go to the Network Pane.Plug in your USB Adapter, with a live ethernet cable.Open your terminal, and run sudo kextload /System/Library/Extensions/USBCDCEthernet.kext.Once you're booted back up, download and install the drivers from the CD, kindly uploaded by this fine human being.Unplug your USB adapter, and reboot and give yourself a clean slate.Uninstall the dozens of other drivers you may have installed in the process of trying to get this working.Steps to get your adapter working if you've never used the adapter before in Mac OS 10.11 El Capitan. Definitely take a read down below to see what's changed in El Capitan, and if disabling SIP makes sense for your setup.When you boot back up, you'll have a working adapter!.As with all advice on the internet, you can't sue me if this sets fire to your cat or sends ninjas to your house.

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