If you want to activate McAfee product key, first you will have to locate the product key. Below are the steps you can go through to find McAfee product key: You will be required to locate the McAfee antivirus installation box Under the installation car, you will get a retail card Behind this card, you will be able to get the 25 digits These are the steps to find the product key if you have purchased the product from offline mode. However, if you want to know about the process of finding product key if you have purchased the product from online mode, you can get in touch with mcafee customer care to avail assistance from the experts.