Mafia II Fling Trainer
Trainer troubleshooting: The most common problem getting a game trainer to work is compatibility between the trainer and the operating system version, if you are using an older game trainer and running Windows 7 or Windows 8 it simply won't work, if however, you right click the trainer and choose Properties and then Compatibility you can change this to run in Windows 98/ Windows 2000 etc. You can find more information on the Beginners Help page here
Mafia II fling trainer
VersionsIt is also possible that you will sometimes see this error because your version of the game does not match the version the trainer was built for - for example because you are not using the correct trainer for the store you got the game from, or either are in need of an update
Cracked / PiratedIf your copy of the game is illegally acquired, as in cracked or pirated, then there is no guarantee the trainer will work, nor will WeMod update the trainer to do so. WeMod does not condone theft of intellectual property - buy the game properly.
Player-made modificationsSometimes player-made modifications, for example from NexusMods, may also cause trainer injection issues if they happen to make changes to the memory addresses that a trainer needs to inject its code into. Modifications that could be considered cheating in the game are most likely to cause this.
Due to the unavailability of numpad keys on some laptops, trainers are difficult to use properly, and most people end up using keyboard re-mappers which messes up stuff with their registry, and some even recommend plugging in external keyboards.
When you first run autohotkey it'll open a default script file, you can just replace its content with the above, save it and and then you're off to the races. Your trainer will now listen to your number keys as if they were on the numpad.