This game creates the game code on the fly.
Make sure to activate each option during gameplay.
You may have to shoot your weapon, kill an enemy, run, jump
or get some money the normal way before activating any option.

just fallow the trainer instructions, It will tell you if you
need to do anything in order for you to get an option working.

! You dont need to activate the trainer by pressing F1 !
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TRAiNER OPTiONS:

!!! Activate During Gameplay !!!

NUMPAD 1 = INFINITE HEALTH

NUMPAD 2 = EASY MONEY

NUMPAD 3 = UNLIMITED AMMO ( SILENCED PISTOL )
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TRAiNER NOTES:

! You dont need to activate the trainer by pressing F1 !

! Activate During Gameplay !

Option 01: This option will give you infinite HEALTH while this
option is turned on. Activate this option during a
mission.

Option 02: This option will give you a nice amount of MONEY each
time that you pick up money the usual way while this
option is turned on. Make sure that you pick up some
money before activating this option.

Option 03: This option will give you unlimited AMMO while this
option is turned on. This option works for the silenced
pistol only.

Happy to spend RC to get an update

Link

Otherwise you can try CoSMOS.

Link