Buggy "Link to Qt" dialog in QDS 4.2.0

When starting up a newly installed version of QDS (installed from the Qt Maintenance Tool), it asks to be linked with Qt. (dialog across bottom of screen) It was not possible to link it with anything.

>Question: Why is it not aware of what Qt versions I have installed?

It says I can do this later by going to Edit -> Preferences -> Kits and adding the kits later.

>There is no "kits" menu here.

Eventually, it comes to this dialog:

The path there is pointing to my Qt installation, but it doesn't offer "Link with Qt". The button is greyed out. Browsing around with "Browse" does not solve it.