Installing High Sierra
If your Mac does not recognize the USB drive when you hold Option during startup, reformat the drive using Disk Utility with these exact settings: Mac OS Extended (Journaled) and GUID Partition Map. Then rerun the createinstallmedia command. Some users have success using a different USB drive, as not all drives are equally compatible with bootable creation tools.
Use format for SSDs or Mac OS Extended (Journaled) for HDDs. Close Disk Utility. Select Install macOS and follow the on-screen instructions. 3. Upgrade Installation
Press , type your administrator password, and press Enter again. Type Y to confirm the formatting and transfer process. macos high sierra download dmg install
This is another variation of the certificate issue but can also result from an incomplete DMG download.
Select your internal hard drive (usually named Macintosh HD) from the left sidebar.
High Sierra often requires a firmware update during installation to support the APFS file system. Ensure your Mac is plugged into power. Installing High Sierra If your Mac does not
Open Terminal and paste the following command: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
If your goal is to install High Sierra on a Mac, you must convert the contents of the DMG (or App) to a USB drive.
This is the core of the process. Follow these steps meticulously. Use format for SSDs or Mac OS Extended (Journaled) for HDDs
Because High Sierra is hidden from standard App Store searches, you must use a direct link. Open Safari and click the link below to redirect to the Mac App Store: macOS High Sierra on the Mac App Store Step 2: Download the Installer Click the button. The Software Update system preference pane will launch. Click Download when prompted.
If Terminal intimidates you, use (free) or Install Disk Creator – both apps have simple interfaces that automate the above command.
Open your web browser and visit the official Apple Support page for older macOS versions . Click the link for .