I'd like to see a Steam Version Please
Did you even test the trainer before posting this?
This game comes through STEAM only, so the available trainers are for the STEAM release of the game.
Well, the trainer description says "WRITTEN FOR THE ORIGINAL RETAIL VERSION OF THE GAME". There's usually a difference between RETAIL and STEAM, so my first thought was "What's this? They released a physical package?". Best to edit the trainer's description just to avoid further confusion.