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do i need to download antivirus on iMac? or it protects himself?
I've never used an antivirus program on my Mac, and I started with a Mac Plus in the late 80's.
As long as you're smart and don't download and install software from dubious sources, it's not something you likely will ever have to worry about.
Wayne Priestley19,579 Points
Open your system preferences/security there you will see three options,
All applications downloaded from:
Mac app store
Mac app store and identified developers
Changing the setting to anywhere will let you launch the application, (I take it you trust the developer)
Then I would suggest changing it back to Mac app store and identified developers.
Hope this helps.
I've never run antivirus on my mac in ten years.