Unable to get a trainer to work is a description lacking of any useful details. You should be more specific.
The trainer istelf starts and I hear "trainer activated" when I'm on the main menu in the game. I also hear "activated" when I hit Num1 and Num2 in-game. But money is still deducted from my account when I buy a solar panel from the administration menu (C-key) or when I buy a tractor in the store menu (O-key).
Which version of the game do you have and which is your source (steam, retail, gog, gamersgate?)
Game version is 1.1.0.3 (Steam).
The process name is agrarsimulator2013.dll.
The trainer status reports the game is running.