Trainer has been tested and still works. Make sure you activate the trainer while being in a dungeon.
The trainer isn't working at all.
It is giving the 0x90 error no matter where you activate it first. (Main menu, in a dungeon, etc)
Can we please have an update?
Reinstall .NET framework 4.5 and try again. The game uses .NET code and code is different on the used framework.
Microsoft .NET updated to 4.5.2
0x90 "Game Code Could not be Found"