The navpack-coco4.zip file you have requested: Tools and Utilities / Miscellaneous / CS:S Nav-pack 4.0 - 12.2mb is not available. Perhaps try browsing all files for the game Counter-Strike: Source and upload any files you want to share or are missing. This is the only information we could locate:

Nav-meshes for the official CS:Source-Bot

Turtlerockstudios.com
Steampowered.com

Counter-Strike Source

Extract *.nav to: ...cstrikemaps

Maps CSS: Nav-files for CS:S- hand-tuned and placepainted

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