You can get the same effects without downloading external software by enabling the game's internal cheat system.
If you are running a highly specific modded version of the game where console commands are restricted, a traditional trainer might be your only choice. How They Work call of duty 1 trainer unlimited health and ammo
While third-party trainers (software programs that modify game memory) exist on archival sites, they frequently trigger antivirus false positives, crash on modern operating systems like Windows 10 or 11, and vary based on your specific game version (v1.0 vs v1.5). Using the game's native console commands completely bypasses these risks. You can get the same effects without downloading