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This copy of the Install macOS Big Sur application is corrupted and cannot be used to install macOS.
MacBook, macOS 10.12
Running an iMac Antique late 2012 and hav removed from Original Installation of Lion or Mt. Lion all the way up to and including Catalina ( end of the road for updates ) - not issues here.
The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.
With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. Make sure to use Only Safari to commence the download as Others may not work
Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina and Big Sur Only support 64 bit and there is no workaround.
Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation
I'm having the same problem with Mojave. I've deleted the first installer and redownload, but still get the message "This copy of the Install macOS Mojave application is damaged, and can‘t be used to install macOS.'
I'm a bit stuck. I'm trying to get an old 2012 iMac running Adobe software while my 2020 iMac is away having a deep formatting problem sorted. Meantime I can't work! Help!
Delete the old "Install Big Sur" installer from /Applications, reboot and download a fresh copy.
After deleting "Install macOS Mojave" from the Applications folder, try again while in Safe Mode.
Follow the advise of @ Matti Haveri
I should add it's a late 2012 iMac and should be compatible with Mojave.
have macOS Sierra and download macOS big sure when ineed to install it from App Store the problem is This copy of the Install macOS Big Sur application is corrupted and cannot be used to install macOS.
