Upgrading to High Sierra?
I have MacOS Sierra 10.12.6 on my iMac and have been trying to upgrade to High Sierra. I've tried several times through the App store, but the version of High Sierra in the App Store says: "This copy of the Install macOS High Sierra.app application is damaged, and can‘t be used to install macOS." I've already tried to bypass High Sierra and download Mojave instead, but that didn't work. Can anyone help and advise on this? Thanks!
iMac 21.5″, macOS 10.12