Open your Poser 5 directory in Windows Explorer and make sure everything is spelt correctly. For example, I have sometimes downloaded freebies from German users who have set up the directory structure with the German spelling, e.g. instead of "Poses" its "Posen". Or sometimes freebie makers will put the whole runtime directory structure inside a containing folder called "My Freebie" and you have to pull the contents out of that and into the main P5 directory. Aside from that, double check your file extensions. For example, a .pz2 file will only show up if it's in the Pose folder - if you put it in Props by mistake, it won't appear on the list.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire