I think they might be waiting until all of these patches stop. If they are, I wouldn't blame them. Until then, you guys don't *need* to use the trainer. Beginner's a pretty good difficulty if you just want to kill everything in sight with relative ease, or if you want to blow off steam. If you're trying to level perks or something, you can go to KF-Doom, which is a pretty close-quarters map for the Support Specialists out there.
If you don't mind not being able to get achievements or use perks, you can always use the console, too. Not the same function as the trainer, but you've still got your godmode and such.
There's alot of other games that get patched, released, and such, and it takes alot of effort to constantly update the games. They're probably going to update the trainer soon, so don't worry.