You need a steam account in order to play on cracked servers using this method. I have tested this with the skullptura L4D rip.
1. Make sure you have installed steam and have logged in.
2. Add Left 4 Dead as a non-steam game (add the shortcut to the games menu).
3. Go to the steam community tab. Search for L4D cracked server groups. More specific instructions are in the readme.
4. Extract the contents of the bin folder to your L4D directory
5. Start L4D from the steam window.
6. Click Play Campaign > Play on Steam Group Server > Click a server > Play!
- Code:
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http://uploading.com/files/3MGW2697/L4D_Play_on_Non-Steam_Servers.zip.html
Don't forget to say thanks!