Okay everyone who is saying the game has updated, that is true but you can still use the trainer all you have to do is "on steam right click on undertale and go to properties, than go into betas and in the tab you should see something with a drop down box saying select the beta you would like to opt into, you click the drop down box and click old_version_100". The game would update but you will still have your save file so dont worry, after you get in the game use the 2016 trainer and you should be raring to go. BTW GreedyBacon when you are in the fight with Sans use Inf Health when the battle is starting otherwise you might continuously die over and over without him even going into battle mode. All right I hope i helped everyone, have a great day, afternoon and night bye