Because the game is no longer sold on modern storefronts like Steam or Epic Games, it is often classified as "abandonware." You can find legitimate preservation copies through community-vetted sources:
Shrek 2: The Game — How to Download and Play on Modern PCs Shrek 2: The Game Download PC Game
Websites like Uptodown also host installers for the Windows version. How to Install and Run on Windows 10/11 Because the game is no longer sold on
The PC version was originally designed for Windows XP, so getting it to run on modern systems requires a few tweaks: Shrek 2 DevKit Release v1 + Full Editor Tutorial Shrek 2: The Game Download PC Game