While the full retail version of Blood (1997) is still under copyright and sold commercially, you can legally download the for free , which includes the entire first episode, "Post Mortem". Where to Find the Shareware Version
If you download the original DOS files from an archive, you will likely need an emulator or a source port to run them on a modern PC: Blood (Monolith 1997) Free Download
: An enhanced remaster by Nightdive Studios available on Steam and GOG . While the full retail version of Blood (1997)
Blood : Free Download, Borrow, and Streaming - Internet Archive which includes the entire first episode
: The original DOS version bundled for modern systems, found on GOG . How to Play the Original Files