There is no license number. It counts up how many installations you have the software installed on and then limits them once you have reached the maximum.
The information is on your account page at https://home.mcafee.com/secure/protected/login.aspx? which is where you download it from.
If you are having problems with licensing errors or discrepancies please call Customer Service. It's a free call:
To speak with a Customer Service representative, call us at 866-622-3911.
Average contact length: 10 minutes
Estimated wait time: 10-15 minutes
Hours of Operation: Available daily, 6am-6pm Pacific
How did you purchase the McAfee security, whether it is a Online purchase or you have any CD to install it. If you have purchased McAfee Online and it is a first time install, follow the steps given in the below link to install one license on the Computer. Thanks,
If you already have Existing McAfee installed on the computer follow the steps given in the below link.