Before you can use the mod tool, you must setup at least one pack. See the Mod Packs Page for download links.
1. Once you've downloaded a mod pack, unzip it's contents to any location temporarily on your computer. (You can delete this folder after you're done the Mod Pack Setup section.
2. Inside of the mod pack's folder (it may be 2 levels deep) you'll find a few folders that should include Packs, Paints, Schedules, and Stats. Note: They may include additional folders and files, but this is the minimum needed to work.
3. Select all of these folders (Ctrl + A) then cut (Ctrl + X)
4. Navigate to where you placed your Mod Tool (The folder that has the Application and a few folders such as DataFiles, NT04Data, Player) and go into the NT04Data folder. Paste the files you cut in step 3 here (Ctrl + V)
5. If you're prompted to overwrite any files, make sure you select Overwrite All Files (especially if downloading a pack update)