For use in P12/13, you need to save the G9 in poser folder.

* Ref: https://www.renderosity.com/forums/comments/4405076/permalink

" Meanwhile, anything Genesis to be loaded into Poser 12 needs to be modified in P11 first and then resaved into the Library. That means material collections, poses, hair, and clothing. Otherwise, the files will call upon DSON and we know that the program is not reliable in P12."

https://www.renderosity.com/forums/comments/4405122/permalink

"Load the figure into the scene. You should not see any call for the DSON script and if everything goes correctly, you should see a fully textured G8 figure appear in the scene."