I don’t know if it’s not possible to add to the library with the trial. I thought it was but I could be wrong. Something to check is to make sure the content is in the correct library folders. They need to be in one these character pose material scene props lights cameras faces or hands. I don’t have poser in front of me so I don’t remember which folders are plural names. Texture images need to go to the texture folder. Geometry, things with an obj extension, should go under the geometry folder. 

Also if the folder path is something like runtime/redphantom/libraries/. It needs to be moved so the path is runtime/libraries 

finally if you are installing while poser is running you may need to refresh your library. There is two arrows in a circle in the very bottom right corner to do that

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I use Poser 13 and win 10