I do not know about skies, but for the upgrade from version 5 to 6 I copied my user object presets over using windows explorer instead of importing and exporting and it worked.  Altenately you could open up both  preset folders side by side and copy them over.  I need to find my backup with my user materials and copy them over to Bryce 6.1 now as well.

Free men do not ask permission to bear arms!!