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

Recently I got this error message while trying install El Capitan on iMac from mid 2007. I tried changing date (common know certificate problem) – but it did not resolve problem.

I downloaded image from two sources (including official Apple servers) they got exactly same SHA1 and comments of people state it was working.

Because of that I decide use most hardest way – installing MAC-os in unattended way that bypass any check(s).

Boot from created install media & instead starting installation open terminal and execute following command:

installer -pkg /Volumes/Mac\ OS\ X\ Install\ DVD/Packages/OSInstall.mpkg -target /Volumes/iMacHDD

iMacHDD – this is bootable volume name for HDD that You want install Your mac-os (you get it from using disk manager).

/Volumes/Mac\ OS\ X\ Install\ DVD/Packages/OSInstall.mpkg – this is patch to install disk (in my case that was usb-drive)

After executing that command & long wait macOS was installed in unattended way -when it finish just restart computer removing usb media. It will boot straight into new OS and allow first configuration + create new account.

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