5GHz Connectivity Enjoy a better, smarter wireless experience with the super-fast, interference-free 5GHz frequency band.
Upgrade iMAC and MacBook to super high speed 802.11ac Wi-Fi and enjoy streaming video and data. Next Generation Wi-Fi Standard The Edimax EW-7711MAC is the next generation of Wi-Fi adapter, compatible with the 802.11ac standard and delivering speeds of up to 433Mbps at 5GHz - almost three times as fast as 802.11n. Super-speed 802.11ac 5GHz USB adapter upgrades your network device to 802.11ac with the super-fast Wi-Fi speeds up to 433Mbps on the interference-free 5Ghz frequency band. The next generation 802.11ac wireless standard is set to revolutionize Wi-Fi. If you ever do go legit and want to undo it, just reboot into recovery mode and run csrutil enable, and things will be back where you left them.As the Mac 911 columnist at Macworld, I've received hundreds of emails from people who have had Wi-Fi fail on their computers. You might be better off just buying legit Apple hardware so you don't have to disable the security. If you're in doubt, please make the decision that makes the most sense for your security concerns. This also disables malware protection for your machine, and given that we've started to see genuine malware for OS X in the wild, it's a slightly larger security risk than it was in Yosemite. The csrutil disable step turns off SIP for your entire system, which allows you to load and use the drivers.
As "unsigned" drivers, Mac OS refuses to load them, saying they constitute a security hazard.
The old drivers still work, no problem, but are being blocked in El Capitan because they aren't "signed" properly, since they weren't re-issued for El Capitan. Apple has a new security mode, called "System Integrity Protection" (SIP) that prevents anyone - even you with your password - from modifying system files. In short, it's the same scenario as Yosemite, just stricter. If you ever do go legit and want to undo it, just run sudo nvram boot-args="kext-dev-mode=0, and things will be back where you left them.
This is a mild security risk, but it should be fine for most people. What step 5 does is instructs your computer to set itself to "developer mode", which allows you to load unsigned kexts. The old drivers still work, no problem, but are being blocked in Yosemite because they aren't "signed" properly, since they weren't re-issued for Yosemite.
Update Oct 2015: Updated for 10.11 El Capitan!