Disk 4 likely includes . Modern NAM is version 50+. You must completely delete the old NAM files from your Plugins folder before installing the new one. Do not overwrite.
A: Remove all _controller or _traffic files from the upd folder. Keep only _texture , _prop , and _exemplar files. Run the SC4 Save Game Cleaner afterwards. stex collection vol4sim city 4 mods disk 4 download upd