you activate the trainer at the main menu. the game may have patched since january (since this game has patched 300 times since it was foisted onto gamers years ago).
at any rate, the developers have added 100 anti cheat things to it, including a pathetic encryption routine and apparently they added this destroy your items code to it because they are so butthurt that people want to cheat on single player title that isn't some sort of amazing game to begin with.
i suggest you back up your saves, only activate at main menu, and direct any anticheat outcomes that the developers added to this game to the forums THERE. be sure to tell them you think they are pathetic for adding all this stuff to their single player game and that they are literally the joke of the development community for patching their game for 1000 straight months..
best,
Cal
They spent more time on the anti-cheat measures than the game itself, and it tells.
If they spent all that time improving the game, just imagine how almost average the game the could be!