Then double-click the file within, named InstallOS. Double-click the downloaded file to open a window showing its contents. If you're using a Mac notebook computer, plug it into AC power.Ī file named InstallOS. It takes time to download and install macOS, so make sure that you have a reliable Internet connection. Time Machine makes it simple, and other backup methods are also available. If your Mac isn't compatible with macOS Sierra, the installer will let you know. Your Mac also needs at least 2GB of memory and 8.
