Hello and welcome to WeMod, @HungOverNightly. 
Are you replying on the thread for the correct trainer? This trainer did not exist until the 4th June this year - so there was no trainer update for this particular game on the 10th January.
Or do you mean that you have an outdated copy of the game?
Where did you get your copy of the game from? Epic, Steam or cracked?
If you have Borderlands 2 on Epic Games:
This trainer was updated 9 days ago from this post (click). The trainer should be working perfectly fine as long as you have a legitimately purchased copy of this game from Epic Games which is up to date.
Under the Play button in the trainer is another button labelled History. Click this and make sure the most recent trainer is selected.
If you have the game on Steam:
You’re using the wrong trainer. You need this one: Borderlands 2 Cheats and Trainer for Steam.