The problem may be the way you are downloading it. First make sure you are logged into Windows as an Administrator-level user.
You shouldn't need that serial number again but if you have it recorded keep it in Notebook in case the software asks for it.
Try saving the Setup file to your desktop. Right-click it and select Properties and Unblock (if it shows blocked).
Now make sure all of your previous antivirus is uninstalled, if McAfee run the MCPR cleanup tool and then reboot.
(Always use a fresh copy of MCPR as it is constantly updated).
Then double-click the saved setup file and start the installer.
Thanks exbrit for the detailed reply.
There is only one user in my laptop so it should be an Admin-level user. And I tried unblocking the setup file, also using the latest MCPR to uninstall any possible previous antivirus. I even tried to reboot into safe mode with network to run MCPR and the setup file, still seeing the same error.
Is there any customer support available to solve this problem?
You're welcome and good luck ;-)