Possible Virus
Do apple computers require an anti virus to be installed ,I was told it did not and recently I keep getting messages I have a virus. My iMac is 6 years old and I have never had this problem before .
iMac 27", macOS 10.14
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No, they don't need any antivirus app and any popup you see claiming you have a virus is a scam.
See: Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support