How to update component in Qt 5.2.1+?

Question

I see this message:

at least one valid and enable repository required for this action to succeed

whenever I try to update comp

Answer 1

In the Maintenance Tool, start by selecting "Add or remove components" or "Update components". Then click on the Settings button on the bottom left:

Then a Settings window will open and in there, you need to go into the Repositories tab, click on User defined repositories, click on the Add button and type http://download.qt-project.org/online/qtsdkrepository/windows_x86/desktop/tools_maintenance.

Now click on OK and restart the maintenance tool and your problem should be solved.