All of Macs instructions are good, but one thing to keep in mind is if you already have a file of the same name in any directory you are trying to copy to, Windows will let you know about it and give you the options of overwriting, not overwriting or making a second copy (I wouldn't recommend doing that one, might be a big problem down the road). So, for example, if you already have BIAB 2009.5 in there, copying an older version over the top of it wouldn't be a good idea. Go the other way, the new version over the old and then move the old directory to another location. You will still get the notices from Windows about files with the same names, but you should be able to tell it to overwrite them all and end up with the latest versions of them.
Remember, this only applies if you already have files in the target directory. If you create a new directory, it won't have anything in it so copy away without worries.