Launch using Spotlight or locate it under Applications > Utilities . Select your external USB drive from the left sidebar menu.
Select your internal hard drive (usually named Macintosh HD) from the sidebar. Click .
This is the simplest method for upgrading a Mac that is already running a compatible version of OS X.
Error: "This copy of the Install macOS Sierra application is damaged" Download Mac Os Sierra 10.12 Dmg
Apple maintains direct download links for older operating systems on their support servers. You can download the macOS Sierra installer directly through your web browser.
A virtual disk volume will mount on your desktop, revealing an inner file named InstallMacOSX.pkg .
To perform a clean installation (wiping your hard drive): Launch using Spotlight or locate it under Applications
Once you have the InstallOS.dmg file, creating a bootable USB installer is the recommended method for performing a clean installation of macOS Sierra, especially if you intend to install the OS on multiple machines or reformat your hard drive.
Select the boot drive labeled and hit Return .
OS X Lion 10.7.5 or later required to upgrade directly Where to Download macOS Sierra 10.12 DMG Safely You can download the macOS Sierra installer directly
Apple maintains a repository of older macOS versions for compatibility reasons. You can download the package file directly through your web browser.
: If you already have Sierra 10.12 and just need to patch it to the latest version, Apple provides the 10.12.6 Combo Update (2.15 GB) on their Support site . System Requirements
Your Mac will open the "Software Update" preference pane or start downloading the app directly into your /Applications folder as Install macOS Sierra.app . How to Extract the DMG and Get the Installer Application
Once you have extracted the installation app to your Applications folder, you can create a bootable USB drive. This is useful for performing clean installations or recovery tasks. Prerequisites A USB flash drive with at least of storage.
Only download from well-known Mac archival communities (e.g., Mr. Macintosh, dosdude1’s patcher tools). Never download random DMG files from unknown link shorteners.