I don't know about ver 6 but in ver 5.5 you can just move the kpt directory into PS's plugin directory and it will work just fine. This is true of most, but not all, plugin filters. However, PS's plugin menu has limited space. If you have too many plugins installed the last few just won't show up in the menu (I can't remember the actual limit- 11?). But they will probably show up under "Other" on the filter menu. I should mention that I'm on Windows. I have no idea if this is also true for the Mac.