Downloading the installation package of macOS Sierra may be a time-consuming process (the slow downloading of macOS Sierra is a common issue).
Once the downloading process has begun, you should be able to see the progress of the download in the Launchpad. Click the Download button to begin downloading the installation package. Once the App Store window with macOS Sierra is open, you can read the operating system information. A machine with Mac OS is required for this process, as you will be redirected to the App Store after entering these links in the browser (browsers on Windows or Linux are not able to recognize App Store links). This blog post explains the installation process by using Mac OS X 10.12 Sierra as an example. If you do not already have the ISO image, you can create the installation ISO image manually by downloading a package from Apple’s official website. To start, you must have the ISO image of the macOS installer.
DISCOVER SOLUTION Preparing the ISO Installation Image
