Red Sands Extreme Mod

[tata1]

I have red sands running properly and wanted to give extreme mode a try.
after downloading a file and following instructions ( unzipping the folders in sessions\red_sands) it does not work. First of all it says in instruction to overwrite files, but it does not ask me to overwrite anything. Since my red sands is running properly, i suppose all files (red sands ) are in order. After starting new game on impossible all new creatures and features are accessible. However, after starting any combat, Amelie cannot use spellbook, and all attacks (given or received) immediately kill a whole unit regardless of size. It also shows damage done - zero.
Any clues? thank you