The easiest way - download
this zip file, then uznip all the crap into the main cstrike folder (if You are using CZERO - it must be czero folder).
On listenserver (use search button to find what does it mean - I have explained it 1000 times) it's:
a) for CS1.6
...Steam\SteamApps\your@email.address\counter-strike\
cstrike\
b) for CZERO:...Steam\SteamApps\your@email.address\condit ion zero\
czero\
For a dedicated server (You cannot play on that machine directly - You need to join it from other PC):
a) for CS1.6
...Steam\SteamApps\your@email.address\dedicated server\
cstrike\
b) for CZERO:...Steam\SteamApps\your@email.address\dedica ted server\
czero\
Let overwrite all the files if the system will ask You about it while unzipping/copying.
Make sure You know what the mod You have on Your PC (CS1.6/CZERO).