The answer lies in how Frosty Mod Manager evolved. Early versions of Frosty (pre-1.0.5) did not require a manual key because they used a different injection method. However, around 2019, EA released a security patch for FIFA 19 and 20 that also retroactively affected how FIFA 18 handled memory signatures.
folder in your main FIFA 18 directory from a previous attempt, you should delete it to force Frosty to re-initialize with the correct key. Title Update Compatibility: Mods for FIFA 18 are typically tied to the latest patch fifa 18 frosty mod manager encryption key
If you need to proceed for research/educational purposes: examine Frosty’s source code (pre-2019) for key extraction routines, not the key itself. The answer lies in how Frosty Mod Manager evolved
FIFA 18 has a folder at Documents\FIFA 18\settings that holds a ModData folder. Sometimes, a corrupted cache prevents mod injection. folder in your main FIFA 18 directory from
You must launch Frosty Mod Manager after opening your game launcher (Origin/EA App/Steam), but before the game starts.