: While hidden from direct search, Half-Life: Source is still available when you purchase Half-Life Deathmatch: Source on the Steam Store .
: Community guides on Steam Guides provide step-by-step instructions on installing full retextures and HD models for the Source version. Technical Requirements half-life-source-free-download-pc-game-full-version
: For a complete modern overhaul, Black Mesa is a highly acclaimed fan-made remake of the original Half-Life built entirely in the Source engine. : While hidden from direct search, Half-Life: Source