As I understand it, if you upload a replacement PS, the next time that the program opens up to look at your info, it will automatically download the new one and replace it. The exception to this is if they have physically printed out a copy of the old one and from then on look at only the printout rather than the computer.
As said above, it might appear to you that there are two different versions available, but to the program there can be only one (Highlander . . . couldn't resist), so they shouldn't be able to tell that you changed it unless they actually read the first one right away (or printed it right away), which I doubt. So . . .my thought is that you would not need to contact them or mail any other version.
I am fairly confident that the programs automatically download updates, because stuff is downloaded pretty regularly and that many programs can't possibly be that diligent.