Qt can be found here https://www.qt.io/download-open-source
Once downloaded, open the QT installer and follow the prompt
- The Packages that need to be installed can be either 6.6.1 or 5.15.2
- for QT 6.6.1
- Desktop gcc 64bit
- QT 5 Compatibility Module
- Additional Libraries
- QT Location (TP)
- QT Multimedia
- QT Positioning
- QT Sensors
- QT Serial Port
- QT Speech
- QT 5.15.2
- Desktop gcc 64bit
- QT Charts
- for QT 6.6.1
Documentation for QGroundControl Installation can be found here https://docs.qgroundcontrol.com/master/en/qgc-dev-guide/getting_started/