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you need to ask Microsoft how to use Windows ;-)
seriously, use the file McAfee sent you - don't edit it or mess with it. We didn't add stuff to the file - we sent you a brand new file with a higher licence count in it. If you're trying to use a txt file, that's probably the information you sent us - you can't use that as a licence (that's an SLC file which is digitally signed).
you just have to use the SLC sent by McAfee. Any tampering to the license file ensures that it will not work (just as Safeboot mentioned).
However, generally McAfee sends the file in an email. Try using that file again and just replace the file on your file system. The .txt extension can ripped of just by renaming the file extension.
This should work...