Go to Documents/SimCity 4/Plugins .
: While the collections are curated, some files may still require external dependencies hosted on the STEX or SC4Devotion LEX to function correctly (e.g., to avoid "brown boxes"). Modern Alternative stex collection vol4sim city 4 mods disk 4 download upd
Do not download from random "mod database" sites offering an .exe installer. The legitimate Disk 4 is a .iso or .zip containing .dat , .sc4lot , and .sc4desc files – never an executable installer . Go to Documents/SimCity 4/Plugins