While is no longer available as a standalone purchase on Steam, you can still access it by purchasing Half-Life Deathmatch: Source , which now includes the single-player campaign as a free bundle.
: Buy Half-Life Deathmatch: Source on the Steam Store. This is the most reliable way to get the updated single-player campaign and its assets legally. Half Life Source PC Game Free Download
: Retail disc versions from 2004 are often hosted on the Internet Archive for historical preservation, though these may require original CD keys or specific patches to run on modern systems. While is no longer available as a standalone