Because the game is "abandonware" in spirit but still commercially viable, you won't find a legitimate free download from the original developers. However, modern digital storefronts have optimized the game to run on Windows 10 and 11:
Balance the budget, manage pollution, and keep your Sims happy through zoning (Residential, Commercial, Industrial). Download SIMCITY 4 Deluxe Edition PC Game 2003
A must-have community mod that fixes the game's pathfinding and adds endless transportation options. Because the game is "abandonware" in spirit but
Often available for a few dollars during seasonal sales. It includes cloud saving and easy installation. Download SIMCITY 4 Deluxe Edition PC Game 2003