In the read me which version of Hiro?  There is Hiro3 which is a separate stand alone figure from DAZ's Gen 3.

If you go to download.con, you should still be able to locate the free models DAZ was giving away.  This zip contains the base models for V3, M3, A3, and full H3.  The first 3 base models come with expression morphs but if you want more, you will need to buy the head and body morph packs for V3 and M3 and the maps and morphs pack for A3.  Hiro3 has all his morphs included.  None of the models in the zip comes with textures or hair.

If the product requires Hiro4, you will need to check the readme to see what you need.

However since Poser is asking for Hiro, it's likely looking for the H3 figure.