the mega items option kinda works, gives 99 of every item, but it breaks weapons, if you throw that weapon, its gone for good, it won't let you pick the weapon up again, it also effects every item you can purchase from shops.
DO NOT store the 99x weapon in your storage. Broke my game since you are unable to retrieve it saying you don't have enough available slots in your inventory. But aside from that the trainer is great, no other issues at all cept the minor glitches as stated in the posts above.
Trainer just keeps crashing the game as soon as it loads the level, says game stopped working, not my first trainer here, but it is the first time anything like this has ever happened, and I use trainers alottt and ive tried all the suggested fixes but nothing so far, posting here as a last resort, bought game through origin and downloaded on steam.
For those who are having problem with the weak zombies option, turn it off when you are fighting together with other ncp. Turn on when you go on a solo mission. With other options active, you have no problem in the game.