If you prefer physical media, used copies (CD-ROMs) are available through retailers like eBay and Mercari . Be aware that physical versions may require specific patches or community fixes to run correctly on Windows 10 or 11.
Check out these gameplay reviews and walkthroughs to see the original 2003 classic in action: Call of Duty for PC Video Review YouTube · Gaming Pastime Call of Duty (2003) - A Quick Review YouTube · Retro Gaming Discourse Call of Duty (Part. 1) | PC | 2003 | 4K YouTube · Magneteco Play Call of Duty | PC | 2003 | 4K| Longplay YouTube · Magneteco Play Call of Duty® (2003) on Steam Call of Duty 1 Game Download For PC Full Version
The most reliable way to download and play the full version on a modern PC is through official digital storefronts like the Call of Duty (2003) Steam Store Page . If you prefer physical media, used copies (CD-ROMs)