Well, there is no real "Lite Version" anymore.  There is Standard and Pro.  But as for using Poser content in Carrara;  You either have to get a plugin or (highly recommeded) get one of the newer versions of Carrara.  I would recommend Carrara 7 Pro if it's in your budget. 

In the newer versions of Carrara you can pull in Poser content into Carrara just like any other content, from the content browser.  It's easier, faster, less hassle, and generally the best way to do it.  You can still use the "Import" function to bring in a full poser scene (.pz3).  It usually doesn't matter what version of Poser the item being brought into Carrara was designed for.  I hope this helped.