After installing the KDE meta package kde5-6.0.4_2 Konqueror still does not work, but at least for us it's not that important. The important point is Dolphin with root access and that was my fault: I did not read fully the instructions from PKGget. So, sorry, I apologize.
To get system wide root access, one can just execute /usr/bin/dolphin.bin0 .
Executing /usr/bin/konqueror.bin0 does not seem to make any difference regarding Konqueror.
Now installing AnyDesk with the flatpak from flathub.