Get to your main install directory, run file called setup-bp.exe, choose your install language, enter these codes:
Press NEXT button and you got the BONUS content unlocked..
Press [~] during game play to display the console window. Then, enter one of the following codes
To ensure the correct Wishgranter ending, do not have more than one criteria fulfilled.
Play the first mission (rescue a stalker from some raiders) and collect as many items as you can from the fallen. Go back to the camp you begin the game and sell the collected guns. At that point you should already be able to but the silenced handgun and have some spare change (ideally just over 500 RU), if not then do a side-mission for the stalker you just saved.
Once you have the silenced handgun and ~500 RU you should make your way north towards the bridge where you can see 4 or 5 army soldiers engaged with a few stalkers. Save your game and wait until the soldiers got rid off the stalkers and speak to the soldier towards the left of the bridge (close to the debris, not the one at the campfire!). He will let you pass the barricade for 500 RU. Agree to pay the money and he will turn around. At this point you have about 3-5 seconds where none of the soldiers will be looking at you, and the soldier you just spoke to just so happened to be in an area of debris and pipes. Shoot him with the silenced handgun, and MAKE SURE it is a headshot. He will go down quietly, however make sure you un-equip your weapon at the same time.
If you have done it quick enough the other soldiers will not notice a thing and you can loot the body to get hold of a decent weapon, grenades and some anti-radiation caps. However, timing is everything and since the solider's position changes during the fight you may want to make use of your quick-save/quick-load keys. Also, while you are at it, make sure you climb up to the wagon still hanging at the top of the bridge for some more hidden equipment.
To sneak into the armory, push a chair from the other room to the guard. It doesn't matter if the chair falls down partway. When it is touching the guard, jump on it, then jump onto him. The game will push you past him, into the armory hallway. To access it, simply slash the lock with your knife. To get out, use another chair in the armory or the other room.
Instead of using a boring old rusty chair you can have fun. Ok' there should be some red barrels they explode after a few shoots at them walk in to one until it gets to the stairs that lead to the guy blocking the armoury push the barrel up the stairs it might be abit hard but its worth it. Once its up stairs push it as close as possible to the guy gaurding the armoury now shoot the can and watch the guts fly lolz you just killed him and nobody cares that you did it his men didn't care about him after all ..oh and you can break the lock on the door by shooting and/or slashing it off the door.
Pay attention to the light bar on your hood, try to stay in the shadows to avoid large fire fights.