Cannot remove home edition from mac running mavericks as that operating system no longer supported

I have Sophos Home v 1.2.7 on my mavericks mac. As mavericks is no longer supported, I need to uninstall Home. The dashboard doesn't help. The uninstaller I downloaded wants a tamper password I don't have (your administrator requires etc) yet that should not be for the home edition.  What to do now? Surely one of you guys can help me?