Were you ever able to see it? It may not have installed to the correct directory. I'm not familiar with the package.

If it is a Daz product, make sure you installed it as a Poser package.

If it is a zipfile, open the zip and make sure the base directory in the zip is "runtime", and that you unzipped it in a directory on your hard drive that comtains a "runtime" folder.

Sometimes artists put the files inside of another folder, often a "vanity" folder with their name on it, and that can make the products hard to find.

Hope this helps.