MrAntiFun, as several has stated. Due to the most recent patch in GTA 5 named 'Ill-Gotten-Gains Part 2' targeted to bring additional content for Online players, the latest Grand Theft Auto 5 V1.0.372.2 Trainer +12 has ceased to work entirely (Story Mode included). None of the settings work anymore. Will be expecting a newly remade trainer very soon.
On the side note for everyone, the older Grand Theft Auto 5 V1.00 Trainer +5 and Grand Theft Auto 5 V1.00 Trainer +5 Non Steam aren't really great to use as unlike the latest but recently outdated version, you can and will die from falling from high places. Especially from being blown up, definitely from being blown up. Don't bother about accidentally blowing yourself up with explosives, you'll die right away from being too close to a car that imploded.