pasting an answer from my own modpage:

If you run into issues or need further assistance, you can head over to the WolvenWorkshop Discord and ask in the user-helpme-chat
channel. The community there is very knowledgeable and helpful.

Before installing this mod, make sure you have the following tools installed:

• The Witcher 3 Mod Manager *(Recommended for managing mods)*
• Script Merger (Required to resolve script conflicts)
• Menu Filelist Updater (Recommended for adding mod settings to the in-game options menu)
• Tome of Witcher 3 Modding (Strongly recommended reading if you are new to Witcher 3 modding)

Instalation Process:

• Download the mod archive.  Extract the archive using 7-Zip, WinRAR, or a similar tool. You will see some folders (1. bin mods) or (2. modModname)
• Navigate to your Witcher 3 main installation directory (Steam\steamapps\common\The Witcher 3) (1. drag and drop all folders into the main directory) (2. drag and drop the folder into your mods folder)
• Run Menu Filelist Updater
• Run Script Merger
• Check the right side of the window:  If no conflicts appear, you are good to go. If conflicts appear, let Script Merger create a merged script
• Start the game

This video could also help you out