How can I return to mountain lion or lion?

I'm not like El Capitan.

Whenever I start I have to go into the settings of the mouse and reverse the dominant click and it seems slow and lazy on my old iMac.

The only reason why I upgraded was because I received messages on my browser Safari is not not the newest of my bank when you do online banking. I'll just switch to Firefox.

You have a backup Time Machine of Lion or Mountain Lion?  Which operating system was installed on your computer when you bought it?

Tags: Mac OS & System Software

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