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Unable to install Norton360 Basic Lite Telus

Norton 360 goes thru installation process; I restarted computer; no Norton 360 anywhere. Followed "Download & Install...on Mac" instructions but on Step 7, describes an "allow" button in Security & Privacy window for "System software from application 'Norton 360' was not there. THIS BUTTON DOES NOT APPEAR. I cannot go any further to try to fix this installation issue. I can't find anything in the Applications folder.  I have Cantina.