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

During the installation, I was not asked, if I wanted to use Core Storage. In the event, you are asked, the answer should be No. I verified this procedure by running the 'Install OS X El Capitan' application from an internal Yosemite volume. I installed El Capitan to an external drive. The Yosemite volume was unchanged by the procedure.
Feb 01, 2021 The links to download El Capitan and Yosemite will download the.dmg as advertised. I made the USB media and booted to it. Ran the installer, gets all the way to “less than a second remaining”, then errors out about not being verified, and that it could have been modified.

DVD DL, Mac OS X 10.11 El Capitan Full OS Install Reinstall Recovery Upgrade. Latest certificate (expires ). Please CHECK twice if your Mac model is compatible with this macOS!! If you are not 100% sure please check the pics or message me your mac model and year and I can tell for sure if would work or not!

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:

Boot into the OS X installer as you would normally do (hold down option at boot and choose your installer
Disconnect the ethernet cable if it’s connected and turn off wi-fi from the networking menu
Open the utilities menu item and choose “Terminal”
When the Terminal appears, simply type in the following command: date 0202020216
Hit return and you will now see the new date as read back by the system
Quit the Terminal
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?

El Capitan Cannot Be Verified For A

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. Alternative to genius scan app for os x.

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

Why does this work in the Mac OS X Terminal?

El Capitan Cannot Be Verified For A

El Capitan Cannot Be Verified By Google

Please consider a small and secure donation if this post helped you with your issue!