Open-source users must primarily use the online installer. This poses a challenge for developers working in secure environments, air-gapped systems, or areas with limited internet bandwidth. Fortunately, there are reliable workarounds to achieve a fully offline Qt 6 installation. How to Get the Official Commercial Offline Installer
Get-FileHash .\qt-opensource-windows-x86-6.5.3.exe -Algorithm SHA256 Qt6 Offline Installer
The Qt6 Offline Installer comes with a fixed set of components. Typically includes: Open-source users must primarily use the online installer