Select from the main utilities menu, click Continue , and follow the prompts to complete your fresh operating system installation. Troubleshooting Common Sierra Installation Errors
The Terminal will show the progress of copying the files. Once finished, it will display "Done." 4. Installing macOS Sierra on Your Mac
Avoid third-party torrent sites or unverified file-sharing networks, as these packages often contain malware or modified system files. Use the official methods below to secure a clean copy. Method 1: The Direct Apple Support Link
Run the gibMacOS.command file (Mac) or gibMacOS.bat (Windows). download macos 1012 sierra full
Backup all data on the USB drive, as this process erases it completely. Step-by-Step Terminal Method Connect your USB flash drive to your Mac.
Automatically moves seldom-used files to iCloud to save local disk space. Apple Support Pros and Cons
┌─────────────────────────────────────────────────────────┐ │ BOOTABLE USB CREATION │ ├─────────────────────────────────────────────────────────┤ │ 1. Format an 16GB+ Flash Drive to Mac OS Extended │ │ 2. Name the drive "SierraUSB" │ │ 3. Run the 'createinstallmedia' string in Terminal │ └─────────────────────────────────────────────────────────┘ Step-by-Step Terminal Method Plug in a USB flash drive (minimum 16 GB capacity). Select from the main utilities menu, click Continue
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Follow the on-screen prompts. This process install the OS yet; instead, it extracts the actual Install macOS Sierra.app file directly into your Applications folder. Method 2: Download macOS Sierra via Terminal
: Confirm the download prompt. Once finished, the file will rest inside your Applications directory. If the setup wizard opens automatically, simply press Command + Q to close out of it. 🔨 How to Create a Bootable USB Installer Installing macOS Sierra on Your Mac Avoid third-party
From the macOS Utilities window, select and click Continue .
SierraUSB (You can change this, but match it exactly in the command below). Format: Mac OS Extended (Journaled). Scheme: GUID Partition Map. Open Terminal and enter the following command:
If you downloaded the .dmg file from Apple Support, you must extract the full application before you can use it or create a bootable USB drive.