Finding a trainer that works is often a game of roulette. Game updates often break the memory addresses that trainers use to inject code. A trainer designed for version 1.0 might crash a game running on version 1.1. This is why the "Verified" tag on the v100129 trainer is so significant. It promises stability. It tells the player, "This will work. You will not lose your progress to a crash."
These trainers typically include a suite of options mapped to the numpad for quick activation during gameplay: resident evil 5 pc trainer version 100129 verified