No. Half-Life: Source runs on the Source engine. The original Half-Life doesn't. You cannot use mods made for the original Half-Life on Half-Life: Source because they run on different engines and it won't work.
Half Life is the original game released in the late 90's. This also include the popular multi-player mod Counter Strike.'Source' is the name of the new game engine that was designed to run it's...
Well, if you bought the PC version though Steam, you can download Source SDK (free) though Steam, under Library, Tools, then double-click Source SDK to start the download. If you need any help using...