@Rohith
You have to start the installer from the command line and use a different mirror. See here for more details.
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Unsolved Qt and Yocto
• LogEx -
Unsolved QT Android Instalation
• Patar -
Unsolved CLI of qt-online-installer fails in docker
• krafel -
Unsolved Need help on installing qwt
• skishore1998 -
Unsolved How to download 5.15? (Open source)
• Jeroen537 -
Unsolved Build QtMqtt for 5.7?
• CharlieL