Qt6 Offline Installer

Mount the DMG, drag the Qt6OfflineInstaller app to Applications, then run it. macOS Gatekeeper may block it—right-click and select "Open" to bypass.

For long-term projects, keeping the exact installer used at the start of development ensures that every team member (and CI/CD runner) is using the identical toolchain version. The Current State of Qt6 Offline Installers Qt6 Offline Installer