You may have to open up the .hr2 file in a text editor and check on the path to the .obj file. As I remember, some of Koz's hair, particuarly the early ones, has some quite strange pathing information. Sometimes the .obj file is stored in the Geometries folder (where it "should" be) and sometimes it's in the folder in the Hair library. Same goes for the textures.

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