Hi Andrei Mochola,
I understand your frustration.
But I would be able to sort it out once you'll let me know what exact error do you get while updating.
Also, in addition to Flash Player, are you getting update error for Adobe Acrobat or Reader or both?
If possible, please share the screenshot so that I can check at my end.
Hope to get your response.
Regards,
Anubha