I just tried to install this. When do I see the changes? Do I need a new party? Anyone know? I can tell no changes yet because the averine decanter is not sold and my druid hasn't gotten new spells. I went to the black isle icewind dale2 folder and ran the exe of the weidu. It asked me what I wanted to install and I answered. The log correctly shows what I want installed. This seems odd.
most of these types of ease-of-use/tweak-pack mods recommend starting a new game. If you don't, YMMV in terms of what it does for a game in-progress.
I needed to start a new game to make mine effective. I actually installed the more difficult undead Targos, found one part too challenging, so uninstalled it, and I couldn't get any further in the game and had to restart.