Chrome browser shows the extension of Norton Security Toolbar v.2015.5.0.121. When viewing what is in the webstore, the item presented as the extension Norton Security Toolbar v. 2015.5.4.11; but when I click on the button on the page for Install in Chrome, nothing happens. NOTHING CHANGES, and no announcements of any kind occur, and I still have the version 2015.5.0.121 of Norton Security Toolbar. I also tried disabling the currently installed norton toolbar extension but same thing - meaning nothing happens.