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“This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading”

Macbook Pro 13' 2015 with OS X Yosemite on board. I've been trying to install OS X El Capitan, but always get the following message: 'This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading.' By the way this is not a date time issue, date is correct on my computer. FIX This Copy of the Install OS X El Capitan Application Can’t be Verified. If the issue is with your Computer or a Laptop you should try using Restoro which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption.

The reason why this insane message is happening is because as of February 2016, the security certificates that validate these Mac OS X installs seems to have expired. What this means is that when you try to install Mac OS X Mavericks, Yosemite or El Capitan from any USB or external source, the certificate checking process will render your copy of the installer null and void. You will then get the error “This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading.”

Thankfully, as annoying as this is, there’s a pretty easy fix in the Terminal, located on every installer of Mac OS X. Here’s what to do:

1. Boot into the OS X installer as you would normally do (hold down option at boot and choose your installer
2. Disconnect the ethernet cable if it’s connected and turn off wi-fi from the networking menu
3. Open the utilities menu item and choose “Terminal”
4. When the Terminal appears, simply type in the following command: date 0202020216
5. Hit return and you will now see the new date as read back by the system
6. Quit the Terminal
7. You can now begin to reinstall OS X from the main screen as you did before

Why does this work in the Mac OS X Terminal?

The reason why this works is that you are actually turning your computer into a time machine–and you are telling it to go back to the date February 2nd, 2016. This tricks the certificate into believing that the date is now in the past and allows the installation to resume. You can also redownload any installers to get the new certificates, which are located in your purchase history on the Mac App Store. You would then have to make new installer disks with these new downloaded installers.

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If you are trying to install a fresh copy of Mac OS X 10.11 El Captain after downloading it from the App Store and you are using a bootable USB drive, you may receive an error message right before the install kicks off.

This copy of the Install OS X El Captain application can’t be verified. It may have been corrupted or tampered with during downloading.

This error message indicates the MPKG mechanism for checking the application installer checksum (used for proving the install files are valid and from Apple) files failed. It basically means Mac OS X will not proceed installing a copy of El Captain because it can’t prove its authenticity – even if the installation is ok. You can still push forward and install Mac OS X El Captain. Follow the steps below.

Everyone Says: Check the System Time on Mac

Apparently, the system time on your Mac may be off causing the El Captain installer to think your system date is way off. This happens if your onboard motherboard battery is toasted. Check the date to ensure it’s right – follow these steps.

1. Cancel out to the installation (If you are still on your bootable image of El Captain). Go to Utilities -> Terminal.

2. Type date. If your date is correct, then proceed to the next section below. If it’s not correct, continue with these steps.

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3. Set the current date and time. In Terminal, type the following command in this format shown in example below date MONTH(02)-DATE(28)-TIME(01:51pm)-YEAR(15)

Hit enter to apply the new date. It will display. Now, attempt to install El Captain. If it still fails with the same error message, proceed to next steps below.

Force Install El Captain Terminal Command

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If your confident the install you just downloaded from the App Store is valid, just use Terminal to force install it. You can do this while still booted from your USB Drive or media. Follow the steps below.

1. Type the following command into Terminal, replacing with your Volume names.

2. The install should kick off and you’ll see in Terminal “installer: OS Install started”. Wait for it to complete then reboot.

If all else fails, let us know. You may actually have a corrupt copy of El Captain in the end – maybe you disconnected your USB Jump drive incorrectly causing the files to become corrupt. Try re-downloading El Captain and re-copying it to your media.

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Use the comments form to let us know if you have issues or found another way to bypass this error.