How did you install them? This product worked fine for me by using the install from zip archive in the file menu.

Otherwise you should unzip the file and merge the runtime with the runtime you want them to appear in. I always suggest you add separate runtimes for downloaded content rather include it in your main poser runtime since if you later upgrade to a new version of poser you cannot discard your old poser library even if all the content provided with the earlier version of poser is in the new version library.

If you want to create a new runtime (library) for them, create a folder called whatever you want, for example Poser G2 clothing, and in this create a folder called runtime. Now click on the add library icon in the library window (upright books with a plus sign), navigate to the folder you have created in the window that opens, select it and click ok.

If poser asks you to locate files in means you have either put them in the wrong place or not copied them to the runtime at all. An explorer window opens and you can use this to find the files manually if all else fails.