A real Mac + macOS Sequoia Beta .app (Downloaded via Terminal or Developer Portal).
Apple does not provide a direct ISO download. You must first download the full installer package ( .app ) to your Applications folder. mac os sequoia iso
Because Apple does not officially provide pre-built ISO files, you must create one yourself using the official installer from the Mac App Store . Step 1: Download the macOS Sequoia Installer A real Mac + macOS Sequoia Beta