Instructions:
1:
Extract better_creatures 840.xml and better_creatures 960.xml files here:
For Windows XP: C:\documents and settings\username\appdata\remere's map editor\extensions
For Windows Vista, 7 and newer: C:\users\username\appdata\roaming\remere's map editor\extensions
2:
Extract creatures.xml in RME\data\960 and run your RME.