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![]() ![]() Go to the Use Safari to download macOS section and click on the OS you want to install.īefore upgrading make a full back up of your Mac.Ĭheck that third party apps you use have updates available for the new OS.Ĭheck that your printers/ scanners etc have updated drivers and software available for the new OS.Ĭonnect your mac to your router via cable rather than rely on WiFi.ĭo not use your mac while it is downloadingĪnd do not use any other devices that share the same internet connection. 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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