Mac Helpmate is free and I've used it or a version of it on all of my macs. When using the Sophos uninstall left residue files,I opened mac helpmate and did a search to see what files were left. Then I used clean and optimize in that program.When I tied to reinstall the new antivirus after that,it went through.While using a third program may not be advised,it workedfor me. I had installed and uninstalled Sophos three times.
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