Go to your steam directory and get to the steamapps folder. The files you need should be in there. I'll help you do this step by step. Provide a screenshot to show that you know what you are doing.
If all the required .gcf files are in that folder, fire up steamrip and browse to the location of the steamapps folder. Once you are there, press enter/ok. The most important thing is that you need all the required files to run CS: S.
I have a problem with SteamRip 2 and Counter Strike Source also with Steam Buster V1999
If i start CSS the game crashes (SteamBuster) and with SteamRip i get a Blackscreen in CSS but i can click on the buttons and i can hear a sound but all is black ^^
But Half Life 2 works fine on SteamRip an Steambuster