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The permission denied error says that calibre attempted to access a location where the user does not have the necessary rights. Does it still happen if you disable McAfee? Or try restarting your computer in Safe Mode and then running calibre. Did McAfee or other programs install an update between installing calibre and when it broke?
If you look at results from using VirusTotal, McAfee is among the top 3 in false positives. In my testing about 2 years ago, McAfee did not find any infections that Microsoft's anti-virus did not also find and it found quite a few files that were listed as infected when neither Palo Alto, Microsoft nor Malwarebytes flagged the file.
The other functions that Norton and McAfee want to install should not be permitted near your computer, IMNSHO.
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