If the App Store says ‘Open’ then it is detecting a previous download of the install app Then go to the Download OS 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. Go to Check Compatibility to see if your mac qualifies for the OS upgrade you want. How to get old versions of macOS – Apple Support Which OS you can upgrade to will be governed by which model and year your mac is.Ĭlick on the top left of your screen click on About This Mac to find out the year of your mac. The App Store Updates page only informs you of updates available for the OS you are running.
