Manage your Norton Account. Fix Problems Opening Norton for Windows. Install Norton device security on Mac. FAQ: Norton and macOS Big Sur (11.x) Fix problems opening Norton for Mac. I see the message 'At Risk: Your Vulnerability Protection definitions are not up-to-date. Your Mac may be at risk.' Type in your email address and password for Norton, and click Sign In. In the My Subscription page, under Norton Utilities Premium, click Download. In the Get Started window, copy the Activation Key that is provided as you need to enter it during the activation process. Click Agree & Download.
To install your Norton device security product on Mac, you need to have Mac OS X 10.10.x (Yosemite) or later. To know the version of the Mac operating system installed on your Mac, click the Apple menu icon at the top-left corner, and then click About This Mac.
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Sign in to your account.
Type in your email address and password for Norton, and click Sign In.
In the My Norton portal, click Download.
In the Get Started page, click Agree & Download.
When the download finishes, double-click the file that you downloaded to launch the Norton installer.
Before you install Norton, click Norton License Agreement to read the product license agreement.
Depending on your operating system, select one of the following: