BUT AN APPLE TECH SUPPORT AGENT advised me to use whatever anti-virus program he himself loaded for me. This was over two years ago so I'm foggy on the details. I have Bitdefender Antivirus (for mac) I had uploaded a previous free version, or became confused and thought Bitdefender was the same as whatever free antivirus I still have, or do not have, because I did, in fact, have a virus. Regardless of the clarification, my takeaway was the former: NONE NEEDED. Or maybe I'm confused: no specific anti-malware is RECOMMENDED by Apple. 'Does Official Apple Support recommend any macOS Anti-Malware?' I've read the response to another recent string:
