The High Sierra installer will begin copying the system files to the new target drive.Provide that information and click Add Helper. A new dialog box will pop up, requiring you to input your administrator password.Click on the Agree button again to verify your action.Press on the Agree button to agree with the software licensing terms and agreements flashed on your screen.If you have accidentally quit it, you can restart it by going to the Applications folder and double-clicking on the installer. The High Sierra installer should now be open on your Mac.With the High Sierra installer ready, it’s time to actually install it. Once the download is completed, the installer should launch automatically.It may take long, especially if it’s your first time accessing the App Store. At this point, the download will start.Find macOS Sierra in the rightmost column and click on it.Open the Mac App Store by simply clicking on the App Store icon in the dock.High Sierra is available for download from the App Store. Here’s how to upgrade from El Capitan to Sierra. Upgrading from El Capitan to SierraĪfter backing up your Mac’s important files and folders, it’s time to get started.

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El capitan vs sierra vs high sierra