Not a valid excuse as far as I'm concerned. You can't expect paying customers to ONLY play new games all the time. You either support your products or remove the download until it's working.
Or better yet, make older trainers free. Since, y'know, there's no guarantee they work anyway.
Or better yet, we can retire the game and simply remove all the trainers if "they're not guaranteed" to work since you're ungrateful to the staff for trying the best they can with an aging game.
For the few people reporting problems here, there are many other users using the trainer properly suggesting the problem is on your end and that you're not properly troubleshooting your game and trainer.