I still get thrown when I point Poser's external library at an un-zipped down-load, but item does not appear where expected.

Assuming the 'run-time' is correctly organised, may be because some 'objects' land in  'props' library as PP2, while others land in 'characters' as CR2.

FWIW, I find library UI exasperating at best, and infuriating when run-time of interest is hung off very bottom of list, in teeny-tiny font, with scroll-bar shrinking to a whisker...