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:
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 Blood (Monolith 1997) Free Download
: Hosts various versions of the game, including the shareware files for preservation. If you download the original DOS files from
: An enhanced remaster by Nightdive Studios available on Steam and GOG . which includes the entire first episode
Blood : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive Blood - RGB Classic Games