more than likely its because the game version has updated to 1.15 and your trainer is 1.14 and thats why it crashes will do the same to me. As far as what pwiz said earlier in a post, They wont update the trainer to a new version because they have had so many patches for the game already. 5-6 so far in a week. I would just wait you can play story its just takes the skill to play it. Or you can go for open world gameplay.
Maybe... But I've exactly the same behaviour with one of the old Deathspank: The Baconing trainers too - so it's definitely an issue on my end.