Welcome to the community @ShadowMonk2021.
The trainer does not need an update. Because the game has not been updated since 2009, which was 12 years ago. Trainer updates are only necessary after the game has updated.
Try launching the game first, then pressing Play in WeMod once on the main menu.
Make sure you are using a legitimately purchased copy of the game. Trainers are made specifically for store-bought versions, not cracked/pirated/illegally stolen versions.
If it is legitimately purchased, see here: "Wemod failed loading the cheats into your game" / "We’re having trouble downloading the cheats" - #2 by Ravenfyre.