: 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.
: Downloads from third-party "free full game" sites often contain viruses or broken files that can compromise your PC's security. Half Life Source PC Game Free Download
: Use Steam, GOG, or Humble Bundle for safe and legal downloads. : Buy Half-Life Deathmatch: Source on the Steam Store
Valve officially delisted from search results in late 2023 to prioritize the original 1998 version as the "definitive" experience for the series' 25th anniversary. Ways to Play Half-Life: Source 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.