For developers who prefer a clean installation without manual file transfers, you can build the designer components directly. QML module not found (QtQuick.Studio.Components 1.0 )
After conversion, delete the import QtQuick.Studio.Components line. The error will disappear entirely. module qtquick.studio.components is not installed
import QtQuick.Controls 2.15
To prevent similar issues in the future: For developers who prefer a clean installation without