Summary
Create Bootable Media: If you need to do a clean install, you can now use this app to create a bootable USB using the createinstallmedia command in Terminal. Updates Only (For existing 10.12 users)
Apple provides a direct download link for the macOS Sierra installer in DMG format: Download macOS Sierra 10.12 from Apple Support Mac Os Sierra 10.12.6 Dmg File Download
This guide explains what macOS Sierra 10.12.6 is, what a .dmg for it typically contains, official vs unofficial sources, how to obtain the installer safely, how to verify integrity, how to create a bootable installer, common problems and fixes, and security/compatibility considerations.
: Because it is the last stable build, the 10.12.6 DMG or ISO is the preferred choice for running macOS Sierra in virtual machines like or VirtualBox on non-Apple hardware. Core System Requirements macOS Sierra 10
Backup: Always perform a Time Machine backup before attempting to install or reinstall an operating system.
(approx. 1.98 GB) to bring any version of 10.12 up to the final build. Clean Installation Core System Requirements Backup : Always perform a
Create a Bootable USB – Once you obtain the Sierra 10.12.6 installer, you can use Terminal commands to create a bootable USB drive for installation on multiple machines.