Sorry, wont the solution you posted just prior to this work easier?
I would imagine Mark Vissche is monitoring all these threads anyway, let's hope he chimes in.
Well, yes, that solution will work, but how do we know that McAfee hasn't posted an even newer version on the download site?
First you have to download it to see it's a different size, then you have to actually install it to find out whether it's newer or older.
As I'm trying to say, this has always been a bit of a problem. One cannot, at a glance, tell whether the version on the site is the same or newer than the one installed (and in this rare case, may be older.)