Since this took me about 4 minutes longer than it should have to find this on-line (anywhere)Here you go. If you downloaded the version of CS4 that didn't included the proper goodies and presets folders, this is straight from adobe. 

For mac, windows 32bit, and 64bit supposedly.

Unzip, double click, note the directory, copy and paste into the proper folders and you're off.

I still haven't read anything about the full replacement for the extract plug-in, but then I don't look very often.  Enjoy folks.