El Capitan Cannot Be Verified

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However, when I updated to El Capitan and SoundflowerBed would say that soundflower was not installed, so I installed the new version of soundflower through the link posted on this forum, but now when I choose any output on SoundflowerBed it crashes and I get no sound. This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted - YouTube. Question: Q: El Capitan installer cannot be verified I am trying to upgrade an older iMac (2008) from OS 10.6.8 to El Capitan for a disabled client who really needs to use a Mac instead of a PC! EveryMac says it can handle El Capitan if I upgrade RAM. Many Hackintosh users running Mac OS X Lion have been unable to login to the Mac App Store, instead receiving the error, 'Your device or computer could not be verified. Contact support for assistance.' The verification issue appears to have affected the several legitimate Macs as well, though on less wide of a scale.

The other day a co-worker needed to borrow a Mac, so I grabbed an older MacBook Air from storage. I decided to wipe out the laptop’s flash storage and install a fresh version of OS X. I created a bootable USB flash drive installer, plugged it into the laptop, pressed the Option key as the machine booted, and then selected the USB drive as the boot disk.

I then ran Disk Utility to reformat the drive and then ran the installer to install OS X. It looked like things were moving along, until this appeared on the screen.

I created another boot disk using a different storage drive, in case it was a hardware problem, but I got the same error. I figured that the fact that the laptop had been in storage for a while had something to do with it, and it did.

Note: This fix should work with OS X Mavericks and El Capitan. It also worked for me with macOS Sierra, which shows a different error message (“The installer payload failed signature check” pops up near the end of the installation) than the one that appears for El Capitan and Mavericks.

How to fix the problem

The installer checks the date on the computer. If the date isn’t current, you get the error above. The fix involves correcting the date on your Mac.

If you have an older OS on the Mac

If you have a complete OS on the Mac already, boot into it. Fix the date in the Date & Time system preference (Apple menu > System Preferences). Reboot using the USB boot disk, and you should be able to proceed with the installation.

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If you don’t have an OS on the Mac

If you are in a situation like I was, and you don’t have a complete OS on your disk (you reformatted it), you’ll find that there’s no way to access the Date & Time system preference when you use an external USB boot installer drive. The Apple menu doesn’t give you access to System Preferences. You have to use the Terminal to set the date and time.

Verified

If you use an external boot disk, you Mac starts up into OS X Disk Utilities. You can access the Terminal by clicking on the Utilities menu and selecting Terminal. Once the Terminal has launched, follow these steps.

  1. At the prompt, type date to see the date that’s on the Mac. For example, here’s the date of the MacBook Air I worked on.
  1. If your Mac is connected to the internet, you can tell your Mac to check online for the current date and time. You can do this by typing at the prompt ntpdate -u time.apple.com and then pressing Return.

El Capitan Cannot Be Verified Full

Your Mac should now have the current date and time. If you enter date again (as I did in the screenshot above) the information that appears will be current. You can now run the OS installer.

If you don’t have an internet connection

You can still use Terminal to set the date. Go into the Terminal as described above, then follow these steps.

  1. At the prompt, type date to see the date that’s on the Mac.
  2. Figure out the numerical representation of the date and time. The pattern you need to follow:
    • Month: in two-digit format. For example, July is 07.
    • Day: in two-digit format. For example, the 19th is 19. Another example: the 7th is 07.
    • Time: in military format of hours and minutes. For example, 2:00 p.m. is 1400.
    • Year: Last two digits.

In my example, the numerical representation is 0719140016. This stands for July (07) 19, (19), 2 p.m. (1400), 2016 (16).

  1. At the prompt, type date [numerical], with [numerical] being the representation you figured out. In my example, I typed date 0719140016. Then press Return.

The date should be set. You can check the date again by typing date at the prompt. You can now run the installer.

  • I am trying to upgrade an older iMac (2008) from OS 10.6.8 to El Capitan for a disabled client who really needs to use a Mac instead of a PC!
  • EveryMac says it can handle El Capitan if I upgrade RAM. It has 4GB now.
  • I have an Installer file from my own Mac (always keep them when I upgrade). I made a bootable flash installer that mounts and seems to have the proper files, but it won't show up on either Mac on restart holding option key; nor in the Startup Disk list. So, I figured writing to the flash drive must have failed.
  • I partitioned an external hard drive and redid this:

    'sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X El Capitan.app'

  • It seems to work (again) in Finder AND it shows up as a boot option on restart (holding option key), but when I select Install OS X I get an error that the installer cannot be verified. I can't get it to work.
  • So, I figured my installer must have gone bad, even though I successfully upgraded my own Mac with it, and have since upgraded mine to Sierra.
  • Using the App Store I can get to El Capitan, but it will not allow me to download it on my Mac because the system is too new, and I don't want to download it to the old Mac because I want to use an external drive to do a clean install; not an upgrade on the old one.
  • Any advice?
Cannot

El Capitan Cannot Be Verified At A

IMAC (RETINA 5K, 27-INCH, LATE 2015), macOS Sierra (10.12.3)

El Capitan Cannot Be Verified Online

Posted on Feb 28, 2017 9:53 PM