Using this Trainer:

Launch the trainer first, then launch the Game and then Press F1 at the Main Menu.

Listen for "Activated".

Press desired option key

Options in Promo:

Numpad 3: Unlimited Ammo

Options:

Numpad 1: Unlimited Health

Numpad 2: Easy Kills

Numpad 3: Unlimited Ammo

Numpad 4: No Reload

Numpad 5: Perfect Accuracy

Numpad 6: No Recoil

Numpad +: Zoom In

Numpad -: Zoom Out

Numpad 7: Invisible

Numpad 8: Max Expert Level

Notes:

Please note you may have to hold the key longer than normal for it to work because the game polls the hotkeys and take control of the system polling ahead of other applications.

Numpad 1: Unlimited Health - toggle on and most things cannot kill you

Numpad 2: Easy Kills - toggle on and NPC are easy to kill. It's probably best to leave this off unless needed to kill a lot of enemies for a short time to prevent game crashes. Toggle off when not needed.

Numpad 3: Unlimited Ammo - toggle on and most weapons have plenty of ammo.

Numpad 4: No Reload - toggle on and most weapons will not need to reload.

Numpad 5: Perfect Accuracy - toggle on and most weapons will have improved accuracy.

Numpad 6: No Recoil - toggle on and most weapons will have minimal recoil.

Numpad +: Zoom In - toggle on and you zoom the view on the current horizontal plane in further.

Numpad -: Zoom Out - toggle on and you zoom the view on the current horizontal plane back out.

Numpad 7: Invisible - toggle on and all NPC cannot see you. Keep in mind this goes for friendly units as well, who may need to see you to continue scripted events. Use this to pass Stealth sections of the game or to easily kill enemies without them seeing you.

Numpad 8: Max Expert Level - toggle this on and when you next earn any XP for actions, your character will level up to max level and be able to use all weapons.