1. Install the game 
2. Install the patch 1.5.03 
3. Copy your old protect.dll file to a safer place 
4. Place the cracked protect.dll into your game dir. 
5. Mount the Stalker Clear Sky image , run the game , it will throw the bugtrap error ... 
6. Place your old protect.dll back to game dir. 
7. Run the game again , and it works ... 
Now in 3 days when it will ask for a disk again , just repeat these steps ...

Create a new folder called "Gamedata" in the main directory where you installed Clear Sky and in that folder create a "Configs" folder and in there create a "Text" folder followed by a "RUS" folder inside that. 
Copy this file into that folder. 
It's a bit basic but it works for me, feel free to edit it yourself via notepad or similar. 
(I see here that Network needs to be changed to Multiplayer and AA in the options menu needs to be changed to Anti Aliasing, other fixes and changes might also be required but atleast it's readable now.) 
One last thing, open fsgame.ltx and change this line. 
$game_data$ = false| true| $fs_root$| gamedata\ 
To this. 
$game_data$ = true| true| $fs_root$| gamedata\ 
Credits JBeckman 
NFOhump forums

http://rapidshare.com/files/140782641/stalker1.5.03RUcrack.zip