Since updates starting from "Opera 85.0.4341.47" until "Opera 87.0.4390.25" opera browser installed but never could open.
It showed a warning saying I have not administrator rights, which I have.
I wrote the issue in Opera 86 Stable - Opera Forums:
https://forums.opera.com/topic/55318/opera-86-stable/9
but did not have a fix recomendation.
So I revert back to Opera 85.0.4341.18 because it opens and works without asking administrartor rights.
Finally I decided to try Opera GX to see if it was going to show the same warning saying I have not administrartor rights.
No, there was not any warning, and Opera GX opens and works.