If you do a search on the drive you use as main C:/ you should look for a .BIG package and that is where you need to point Xpand2! to so it k ows where to look. I think it is called .big but maybe someone can chime in if you can't find it. On top of the Xpand plugin you have a few dropdowns and there you find the option to point to the .big file for sounds for Xpand2!
Let us know how you get on.