Installing the new Ceiling Mount Light Fixtures was somewhat easy. There was no need to replace the old outlet boxes and I screwed the straps that hold the fixture directly into the ceiling (plaster with wooden lath boards).
There were four of these oldies...
Upstairs I installed a couple of flush mount light fixtures:
A semi flush ceiling mount light fixture for the living room:
And the old ceiling lamp in the dining room has been replaced by a playful chandelier: