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 8: No Mulcher Overheat

Options:

Numpad 1: Mega Health

Numpad 2: Unlimited Ammo

Numpad 3: No Reload

Numpad 4: Can't Bleed Out

Numpad 5: No Turret Overheat

Numpad 6: Easy Kills

Numpad 7: Fabricator Power

Numpad 8: No Mulcher Overheat

Numpad 9: Lightning Protection

Notes:

Numpad 1: Mega Health - toggle on and most things cannot kill you. Scripted deaths are still possible.

Numpad 2: Unlimited Ammo - toggle on and most weapons and some items are unlimited ammo.

Numpad 3: No Reload - toggle on and most weapons can fire without needing to reload.

Numpad 4: Can't Bleed Out - toggle on and neither you nor your teammates can bleed out while down.  You can revive them or be revived with infinite time.

Numpad 5: No Turret Overheat - toggle on and turrets you can man will not overheat.

Numpad 6: Easy Kills - toggle on and many non-player entities can be killed more easily.  Note that this might affect friendlies so make sure to check them and revive them if they are down.  Much of the time they revive each other.  This makes playing the game and surviving the waves of enemies much easier and faster.

Numpad 7: Fabricator Power - while you are in the Fabricator and can purchase things, press this and you will see your power is much higher.  It is on for a few seconds and then turns back off. This is best used while in the fabricator and just before you purchase something.

Numpad 8: No Mulcher Overheat - toggle this on when using the Mulcher, and it will not overheat.

Numpad 9: Lightning Protection - toggle this on when in the windstorm and there is lightning around you.  You cannot be killed by it.  Turn back off when not needed.

Temporarily Disable Hotkeys:

To temporarily disable the Hotkeys, press CTRL-H after trainer is activated.  You can use CTRL-H to re-activate the Hotkeys as well.