Disclaimer: This guide is for educational purposes and creating personal backups. Ensure you have a stable internet connection during the download phase.

If the App Store method fails, use this Terminal command to fetch the installer directly from Apple's servers:

System Settings will open to the Software Update section; click .

: As of early 2026, while Sequoia is widely used, Apple has released newer versions like macOS 26 Tahoe .

: If you are using this ISO for a VM (like VirtualBox or VMware), ensure you format the virtual disk as APFS with a GUID Partition Map .

: hdiutil attach /tmp/Sequoia.dmg -noverify -mountpoint /Volumes/Sequoia

sudo /Applications/Install\ macOS\ Sequoia.app/Contents/Resources/createinstallmedia --volume /Volumes/Sequoia --nointeraction