Download the installer directly from the App Store on a Mac, then create a bootable USB drive (not an ISO) using the createinstallmedia command. That’s the real, supported tool for clean Ventura installations.
If you search for “macOS Ventura ISO,” you’ll find no shortage of forums, YouTube tutorials, and file-sharing links promising a ready-to-use ISO file. But here’s the core truth: Apple has never released macOS Ventura (or any macOS version) as an ISO file. The ISO format is standard for Windows and Linux optical discs or virtual machines. Apple distributes macOS Ventura as a DMG (disk image) or through the App Store , bundled inside an installer application.