If you are struggling a bit while downloading the McAfee, then see the instructions mentioned here to learn the download procedure for McAfee products:
Go to an internet browser on your computer. In the URL section bar, please enter www.mcafee.com/activate .Sign in to your McAfee account using your registered email and account password.“Sign Up” if you are coming here for the first time. Choose the following things: Device platform. McAfee security product. Hit Download. Go throughout the complete license agreement and then Accept it. Provide your complete 25-character alphanumeric product key. Kindly look at the product packing or the retail card for the activation key. Wait for a while until the download finishes.