Ran MCPR. Also tried the steps recommended on the Lavasoft support forum (I had visited this site previously and tried most of the rcommendations). I still am unable to get McAfee downloaded. The same error message appears. I am ready to look for other security programs.
I just did a search for 'mcpmain.inf'. Most search results were a torrent site.
Is it possible that there is some malware on your computer that prevents the reinstallation of McAfee ? You could try an online scan with Kaspersky, Bitdefender. For spyware, SAS and MBAM (free), possibly scan in safe mode ?
You could also try the Revo uninstaller to remove leftovers from Lavasoft and other software.