Depending on how DAZ packaged its DSON content and when you might or might not be able to import the content into Poser. When dealing with the DSON installer, you must have a DSON Companion file and a Poser Companion file that go into their respective software. This means that the DSON Companion file goes into DAZStudio and the PCF goes into Poser. Your DAZ Library must be linked to Poser also, otherwise, there will be complications in importing a visible figure or a figure that is fully poseable. It is important that you have a DAZ file and a Poser file, either provided by DAZ or created by yourself. If a PCF does not exist you must create it yourself. There are tutorials on YouTube and other sites that explains the process. DSON Importer will work well with Genesis and Genesis 2, for it to work with Genesis 3 or Genesis 8 you need the Genesis 3 Poser updater. That app will prep the figures for further use in Poser and it has its own set of instructions.

DSONLoader works but it is not very reliable. Much older content will not need DSON because they were already created for Poser to begin with or exist as a set of files for both DAZStudio and Poser. Check the webpages before attempting to install content without frustration.