How to reverse my previous update on my MAcBook Pro Yosemite OS X10.10.5

On 16 July 2016, I've updated my adobe flash player. After that time, I had an ads in my tool bar that the name is Megabackup continuously popup on my screen all the time. I tried to delete it, but without success. My question is how do I restore my system to the State that was before this update? Thank you.

Before attempting to restore to an earlier date, try
How install (really delete) adware
https://discussions.Apple.com/docs/doc-7471

Stop advertising and pop-up advertising windows in Safari
https://support.Apple.com/en-us/HT203987
Adware removal Guide: Identification
http://www.thesafemac.com/arg-identification/
Next if necessary:
Malwarebytes Anti-Malware for Mac
https://www.Malwarebytes.org/antimalware/Mac/?gclid=CjwKEAjw8qetBRCj6vKH8IC_kwoS JADGQ8dSXC2m8LzIJ_6AwtK7xznQOvkb7qN3FBqVS_jjw8JcdhoCCqDw_wcB

It seems that you have downloaded Flash else than Adobe

https://get.Adobe.com/flashplayer/

and adware download included

Tags: Notebooks

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