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MacOS Sierra has been released officially. However, in this topic, we share two methods to download and get MacOS Sierra. Download macOS High Sierra It takes time to download and install macOS, so make sure that you have a reliable Internet connection.
If you're using a Mac notebook computer, plug it into AC power. For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
A file named InstallOS. Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallOS. After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra. Next, click Erase from the toolbar. We need to give the USB installer a temporary name in order for the Terminal command below to work.
Copy and paste the following command into the Terminal window and press Return on your keyboard to execute it:. Terminal will then access the createinstallmedia tool built in to the High Sierra installation bundle. You can monitor the progress of the process via the Terminal window. The time it takes to complete the creation process will vary based on the speed of your USB drive. First, you can connect it to a running Mac and launch the upgrade installer. This will produce the same result as upgrading via the Mac App Store, but it saves you from having to download the High Sierra installer application first.
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