Have just updated my wife Mac Air that was running High Sierra 10.13.6 to Catalina 10.15.7.
Norton Security was already on pc and had been running properly. I now keep getting the message that you havnt finished set up and your computer is not protected....
A screen appears and I follow the instructions to go to system preferences. I then go to security and privacy, click the padlock in bottom left and type in password to unlock it. However there is no Allow button for me to click. When I click continue, Norton tries to validate system extensions but fails. I have restarted mac and cannot seem to get the Allow button that i need to click on to appear.
Help to resolve would be greatly appreciated.