If you want the full game, including all four original episodes and expansions like Cryptic Passage , it is available for purchase on modern storefronts. These versions are often updated to run "out of the box" on Windows 10 and 11.

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:

You can find the official shareware release on several archival and classic gaming sites:

Blood : Free Download, Borrow, and Streaming - Internet Archive