Norton not completing setup, Allow Button in iMac not working even with Tips (tab, spacebar etc....) Norton setup not completing, installation in iMac requires Allow button in preferences (security/privacy:general) not reacting when 'clicked'.  Tried all tips on this sight (unlock, tab, spacebar etc...) not working. Does anyone know if this was changed and if there is a new way to work the allow button to complete the Norton setup? I have tried EVERYTHING on the web to resolve this issue to no avail. I also have 3 other iMac computers that are running High Sierra 10.13.6 as well, and they loaded the Norton software without issue.
the only way you can hit allow is from that computer's mouse, while in front of that computer.  if you try with teamviewer, ARD, vnc, etc, it will fail.  if you're clicking it "in person", perhaps it's confused by some periph or needs uninstall/reinstall.

as a support person, this is a big stumbling block with our users.