The Qt Offline Installer is a standalone package that contains all the necessary files required to install Qt 6 on your computer. Unlike the Online Installer, which downloads components on-demand from Qt servers, the Offline Installer comes as a complete, self-contained bundle.
qmake --version # Should show: Using Qt version 6.x.x Qt6 Offline Installer
Add the bin folder of your Qt installation to your system PATH so you can run qmake or cmake from any terminal. The Qt Offline Installer is a standalone package
Mastering Your Development Environment: The Ultimate Guide to the Qt6 Offline Installer Qt6 Offline Installer
./qt6-offline-installer.run --script qt-install-script.qs --silent