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Do you need to install McAfee with product key? First you need to make sure that there are no other security program is installed in your computer then you need to activate registration number on the website www.mcafee.com/activate. Once you have done the activation process you can login to your McAfee Account & redirect to subscription page of your account & then you can see the button there like Add your device. Now you can start the download & installation of your McAfee security online.