El Capitan Cannot Be Verified

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I’m trying to sell a 2009 MacbookPro. It’s the model MacbookPro5.5 and Apple supports macOS El Capitan 10.11 as latest available version.

I’ve wiped all data from the installed SSD and had to boot from an external disk. Now I’ve got two problems:

05, 2015 Fix OS X El Capitan Beta Updates Not Showing in Software. Sep 4, 2020 — Put the macOS Big Sur installer on. Application cannot be verified. This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted - YouTube. Anybody know if the El Capitan installer cannot be run from inside 10.6.8, to install 'a system' onto the stick? I also tried the 'Chameleon OS X El Capitan Final' installer, with a previous chamelion ENOCH version - it seems to install 'it all' onto the stick, looking pretty good actually - but at the end says 'installation failed'. EL CAPITAN ERROR SOLVED: You should change the clock to 5 years backThis copy of the Install OS X El Capitan application can't be verified. It may have been. This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading. Posted by 5 years ago.

  1. I’ve only got a Mac with Big Sur and Apple Silicon. I cannot use the package installer from the download provided by Apple to create the installer App for El Capitan. However, I need access to the installer so that I’m able to use the createinstallmedia command.
  2. The 2009 MacbookPro is already wiped and has only access to the recovery mode. You cannot execute the package installer in Recovery Mode to extract the media.

Luckily I’ve found this blog post from Chris Warrick who explained how to extract the installer App from the package:

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  1. Attach an external Disk which contains the downloaded pkg from Apple. You’ll need enough space on that Disk to extract the pkg and it needs to be writeable
  2. Open the Terminal from inside the Recovery Mode
  3. Go to the mounted volume
  4. Extract the package:

Now we can try to create the install media from the installer app. Make sure you’ve attach another disk which can be overwritten by the installer. In this example its named „MyBlankUSBDrive“:

The InstallESD.dmg image is missing, which we’ll need to add to the right location:

Os x yosemite download to usb. Now we’ll have a valid installation medium which can be used to start the installer from. You can reboot from that disk and should be able to install El Capitan.

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However, I’ve encountered another annoying issue which caused the installer to fail:

To this day he's had the pleasure of playing on a vast array of different gaming machines.He's a recovering WoW-holic and when he's not playing games he's talking about games, reading about games, writing about games, watching videos about games, watching his son play games or chatting rubbish on Twitter.A lover, not a fighter and an all round good guy (he would say that, he wrote this after all), he's happy to be here as part of GIAG. How to stream xbox to mac. Nick is an avid video game entusiast and has been since his mum first allowed him to play on the Atari 2600 she never touched.

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Oh great… On to the next commands you can try from the Terminal inside the Recovery OS:

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  1. installer -pkg /Volumes/Mac OS X Install DVD/Packages/OSInstall.mpkg -target /Volumes/'XXX' where XXX is the name of the disk you’re installing to.
  2. Wait for the installation to say it’s complete. You will not see any sort of progress display.

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Great, you’ve got El Capitan installed! Apple had some issues with certificates and people found a way to either use the above commands for installation or you’ll have to tinker with your Macs time settings so that the signature is valid again. I would have expected that Apple resigned all installers so I wouldn’t have to use these commands at all but doesn’t look like they did.

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