Yep, I'm getting the same problem. Everything has been updated many times and my download folder has the same update too many times.
If I understand your very unclear message, you probably downloaded many times the installer, so you see several copies of it, with a number appended, which is what browsers do if you keep downloading a file that has the same name, without removing the old copies.
I can see how could be very easy to be confused, and keep reinstalling an outdated version.
So, remove all your existing copies, and be sure you download the CURRENT installer.
Admit it guys eh? The update is bugged.
You are attaching to an 8 months old thread, of an user that clearly had failed to read the release notes, so he got the error message and he was obviously replied to his version was outdated, because he updated without reading the release notes, that required an Addon Manager update and the error was relevant to P3D ONLY.
So no, the update is not "bugged", and it works if you do it correctly.