HT201250 How to go back in time to a certain date

Hi there,
I'm new here new, but I need your generous help.
The other day I downloaded free Adobe Reader XI (11.0.02) on the Adobe official site. Since then I can't read any pdf files on my Mac. I guess I didn't need to download it since I already had it on my PC. Yet, whatever I was working on at that time suggested me doing so, I followed the instructions and downloaded.
If you know any solutions please let me know. I would sincerely appreciate it.
A friend of mine has mentioned that the best way to solve the problem would be to go back in time to just before the date I downloaded the sofware causing problems. ... If it's really the best way, I want to try that but I don't know how. Please help me !
In advance, thank you for your time and generous help.
Regards,
Chiko

Restore the system from a Time Machine backup or bootable clone made before that date.
(77710)

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