mcafee activation online using the internet is easy. Go to the official site and purchase it. Save it, run it and pass through some easy instruction and agree all the policies. When you open, it shows an alert about Activation. Active mcafee online product key online. A product key is of 25-characters and it is sent to you by confirmation mail. But if you want to install it using a CD drive, insert CD and run it. It will start the same process of installation as given above.