i am trying to upgrade my macOS from 10.12 to 10.13 and keep getting an error. how can you help me?
When I try to download the 'Install macOS High Sierra.app application I keep getting an error 'application is damaged, and can't be used to install macos' - where can I download the install app? I am trying to upgrade from 10.12 to 10.13
iMac 21.5″, macOS 10.12