Activating this trainer:

Press F1 at main menu.

Listen for 'Trainer Activated'.

Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:

Numpad 1: God Mode

Numpad 2: Unlimited Ammo

Numpad 3: No Reload

Numpad 4: Invisible/Disable AI

Numpad 5: No Recoil

Numpad 6: Stealth Mode

Numpad 7: Invisible To Cameras

Numpad 8: Unlimited Items Use

Notes:

Numpad 1: God Mode - toggle on and most things cannot kill you.

Numpad 2: Unlimited Ammo - toggle on and when you reload, you have plenty of ammo.

Numpad 3: No Reload - toggle on and when you fire the weapon it will have 9 rounds.

Numpad 4: Invisible/Disable AI - wait until the mission starts, then toggle this on and you can move about the mission and the AI in the game will likely ignore you and remain in position. You can toggle this on and off when you want to move about hidden.  While this is on, if you have not been spotted by humans, you are invisible.  Cameras and etc. will still see you, so plan accordingly.

Numpad 5: No Recoil - toggle on and most weapons will not recoil when you fire them.

Numpad 6: Stealth Mode - toggle this on and you can move about, doing almost all actions, and be unnoticed by the humans in the game. The AI will continue their normal scripted events.  Again, the cameras and etc. are still active in the game, so plan your routes or disable cameras accordingly.  The difference between this option and option 4 is that the AI continue their scripted events.

Numpad 7: Invisible To Cameras - toggle this on and the Hitman will not trigger any cameras when he is in their field of view. May sheild Hitman from view of other things as well.

Numpad 8: Unlimited Items Use - toggle on and some items, such as coins and syringes, can be re-equipped when they are used and used again.  While this is active, when you use an item, swap to another item and equip it, then swap back to the item you wish to use again, and re-equip it.  May not work with all items.  Does not work with Duck bomb, since that item has a detonate mechanic that requires it to deplete.