You appear to have half-life and not counterstrike retail(look at the custom game description)
There are two different kinds of counterstrike, the retail version you buy at the store and the mod you download and add to half-life. If you have the version you buy at the store, then you will need the version they mention above 1.0.0.5. If you have the mod version, then you need the Half-Life patch for 1.1.1.0.
Use google to search for the one you need.