Poser Pro Pack is an earlier version of Poser. If you have Poser 7 you will have more than the required minimum to use the item.

Elke is a customized version of the DAZ figure Victoria version 3. You will need that and its associated morphs in order to use the Elke figure. The V3 figure is available from http://www.daz3d.com/i.x/shop/itemdetails/-/?item=1098&spmeta=rq&_m=d

Hope this helps.