Once you have downloaded the 4.7GB to 5GB file, follow these steps to install: : Double-click the .dmg file to open it.

Once upon a time, in a world where technology was constantly evolving, there was a young professional named Alex who worked as a freelance graphic designer. Alex had been using a Windows PC for years, but after hearing about the seamless integration and user-friendly interface of macOS, she decided it was time to make the switch.

Downloading the Sierra DMG is only half the battle. For a clean installation on an older Mac (or multiple Macs), you should create a bootable USB drive.