How to disable the Guest account on OS X El Capitan About a couple of weeks ago, the Guest user account was automatically enabled on my Mac running OS X El Capitan (by itself, without me enabling it). Now, whenever I start my Mac, I am greeted with a login screen showing two accounts: 1) Mine. 2) Guest user.

I have Find My Mac turned off, as I know people have suggested that the Find My Mac feature may be responsible for this behavior. Beyond that, I have logged out of my iCloud account from "System Preferences -> iCloud," and also disabled the Guest account from "System Preferences -> Users &amp; Groups." Now it shows the Guest user as off in System Preferences. 

However, when I start my Mac, I'm still shown two accounts to log-in. And yes, I have tried and have successfully managed to log into the Guest account despite having disabled it in System Preferences.

This is very strange, and I was wondering if anyone has found a fix. 

Additional Info which may help: I've never had this issue with any other versions of OS X prior to El Capitan. And I've got FileVault enabled, and it's been enabled since OS X Lion without this issue.

I'd greatly appreciate any feedback.
After some extensive testing (and multiple Time Machine restores--to verify that this fix works), I have found a solution. And it's pretty easy too, just don't do it on the go, or you'll wipe out your battery.


Visit Apple's dedicated website to download the OS X 10.11.4 Combo Update
Disable Find My Mac
Ensure that you have disabled the guest user

Install the combo update


Poof! Guest is gone.


Re-enable Find My Mac, if you'd like.
Disable guest user again, immediately after re-enabling Find My Mac


And that's it! It works nicely with FileVault 2, Bootcamp, and Time Machine, so no worries there.