If you want to upgrade to Mojave or Catalina I would upgrade to macOS High Sierra first.įollow the instructions carefully below, read everything. Double-click on that to install macOS Sierra. This does not install macOS Sierra but creates the Install macOS Sierra.app which you will find in your Applications folder, On opening that you would have got an installation window. You tried to install Sierra, this downloads as InstallOS.dmg and you opened that to get the InstallOS.pkg. Okay your iMac from 2013 can upgrade as far as macOS Catalina 10.15.7.
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