SteamLink

SteamLink is an effort to run Half-Life: Uplink, Half-Life's single-player demo campaign from 1998, in Steam as easily as possible, while leaving it as true to the original demo as possible.

No in-game content has been modified, and the "loading" and menu backgrounds are taken directly from the original Uplink, as opposed to the generic Half-Life screens in Steam. The installer will determine your Steam installation directory, and place files in the necessary directory.