I was following the steps below to convert a QDS project for Qt Creator (dummy project but can also be reproduced with the WebinarDemo project):

https://doc.qt.io/qtdesignstudio/quick-converting-ui-projects.html#converting-into-qmake-projects

When I tried to run my project, I got the following error message "module "QtQuick.Studio.Components" is not installed".

Installing them following the steps https://doc.qt.io/qtdesignstudio/quick-converting-ui-projects.html#adding-qt-quick-designer-components-to-qt-installations solved the issue.

I felt a warning or something about the need to install Qt Quick Studio modules could be added in the conversion documentation for qmake. 

Thanks.