Yes I will be allowed tonight
I got in this state by starting the 5.7.2 installer which then told me that Framework .net 3.5 was needed, I clicked on the link proposed to installed it.
At the end of the installation of the Fwk it asked me whether I wanted to reboot, I said no.
Then I restarted the 5.7.2 installer from scratch.
And here I am!