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: Add XP - each press adds 1 XP.
Numpad 1: Mega Armor
Numpad 2: Mega Ammo Clips
Numpad 3: Add XP
Numpad 4: Add Research Points
Numpad 1: Mega Armor - once you are in the mission, press this key once and your unit will have incredibly high armor and be invulnerable to most attacks.
Numpad 2: Mega Ammo Clips - once you are in the mission, press this key once and then when you have to reload a weapon, the new weapon will have incredible amount of ammo in the clip, basically enabling you to fire without reload.
Numpad 3: Add XP - you can use this in the mission to add more XP. You may want to check your XP in the Armory before entering a mission so that you can see how much XP you have. The default amount is 500 per press, although this can be changed using the trainer custom ability. If you add more XP than the current level, the game will automatically increase your level but you gain no perks, so the best strategy is to add enough XP so that when you earn a little real XP in the next mission, you level up and gain a perk at the end of the mission.
Numpad 4: Add Research Points - enter the Armory and then press this option Each press gives you more Research Points. Use these points to unlock things in the game.
Unlock more trainer options including updates from here - Helldivers Trainer