What format does the content come in?
If it is a ZIP file, you should first of all extract it to an empty folder to see what the content contains. If there is a My Library (and you are using Windows), simply drop that onto your My Library folder in documents which should already be listed as a Poser and DAZ Studio formats folder.
All of the content for DS4 goes into My Library by default, but if your content installer is trying to create a folder called ‘Content’ don’t allow that. My Library is the new name for the Content folder, and you don;t want a content folder inside My Library.