Simply select 'Second Life Sculptie' from the "File - Import" menu and choose the sculptie map to import (hint: click filename with middle mouse button to open quickly).
You will be given an options dialog that will let you select the sculptured prim type and the scale (these match the sizes in Second Life®).
The mesh will be imported with 3 multires levels. You can switch between them on the editing panel.
These correspond to the 3 highest levels of detail in Second Life® so you can check how gracefully your sculptie degrades when viewed from a distance.