sorry... but it's easy...
1st: go to the lionhead unstuffer folder, and EDIT (no double click, just EDIT) the LH Unstuffer Batch.bat file, no all pc have the same path to the everithing.stuff, example:
-LionheadUnstuffer -d -path "C:\Program Files\Lionhead Studios\Black & White 2\\" "C:\Program Files (x86)\Lionhead Studios\Black & White 2\Data\Everything.stuff"-
this is the content of the .bat file. Edit the "quotes", change it for another paths, the first is for the black and white 2 folder directory (exe file) and the second is the path for the everithing.stuff. if u done this well, the unstuffer will extract all textures for edit and the landscape editor.
2nd: go to the landscape folder and open landscapeeditor.ini
in the sector (path) change the predetermined path, for your black and white 2 folder path (the exe folder)
3rd: now u can open the landscape editor without problems, i hope it can help u, i had the same problem, but with practice and investigations, finally can use this great editor, good luck! if u have questions, dont worry, i will help u any time, and sorry for my bad english (soy de chile).