Before downloading, ensure your Fable III is actually patched to 1.1.1.3. Right-click the Fable3.exe file, go to Properties > Details. If it doesn't say 1.1.1.3, the trainer will not work.
To activate the trainer features:
Using the allows you to see the content you missed. It gives you the freedom to explore Albion as a true, benevolent dictator or a feared tyrant without the gameplay friction holding you back. fable 3 1113 trainer exclusive