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I am trying to upgrade my iMac Retina 4K 21.5 inch 2017 to Mac OS Ventura. I keep getting an error message;This copy of the Install macOS Ventura application is damaged, and can't be used to install macOS;. Sequoia isn't an option as per updates. ??
In addition to Steve626's recommendation try it while booted into Safe Mode according to How to use safe mode on your Mac and install from there.
Note: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will assure a successful boot into Safe Mode.
Look for a MacOS installer in your Applications folder. Put it in the Trash and empty the Trash. Then restart. Then try again with a fresh start. If possible, connect to the internet via cable instead of WiFi.
Can't upgrade my iMac Retina 4K 21.5 inch 2017 to Mac OS Ventura.
