Uhh, sorry about the delay. I was preparing an update, but it seems that it will wait for a while...
Ok, here is what to do:
1. After you download the mod an d unpack it, go to the mod's Resources folder. Copy "N66_Mods.arc" file from there and place it in your main game's Resources folder. (Titan Quest - Aniversary Edition/Resources). This is to avoid missing textures.
2. Next, take the entire mod folder (All_N66), and for GoG version place it in "My Games/Titan Quest - Immortal Throne/CustomMaps". If you dont have CustomMaps folder, just create it.
3. Launch the game, and start the mod from Play Custom Quest menu. The mod will "bounce" to the main game, where you can create a new character.
4. You have to reload the mod each time, otherwise some custom items may go missing.
Thats it. If you have any problems, tell me and ill try to help.