Click Allow

tell application "System Events"
  tell application "System Preferences"
    activate
    set current pane to pane id "com.apple.preference.security"
    reveal anchor "General" of pane id "com.apple.preference.security"
  end tell
  try
    click button "Allow" of tab group 1 of window "Security & Privacy" of application process "System Preferences" of application "System Events"
  on error
    display dialog "No \"Allow\" button to click, script does not have access, or preferences pane is locked?" buttons {"OK"}
  end try
end tell