Try these in order. You will likely solve the problem by Step 3.

The " Call of Duty 2 failed to initialize renderer version mismatch" error is a frustrating technical hurdle that typically occurs when the game’s executable file (the .exe ) and its internal rendering engine are out of sync. This issue is most common for players running the 2005 classic on modern operating systems like Windows 10 or 11, where compatibility layers can sometimes misinterpret version headers. Core Causes of the Version Mismatch