You can play the Shareware (demo) version for free instantly.
Choose this if you want the "authentic" 1996 experience. diablo-1-free-download-pc-game-full-version
The original Diablo is Freeware or Abandonware. Sites offering "Diablo 1 Free Full Version" are often: You can play the Shareware (demo) version for free instantly
Use the GOG Galaxy client or download the offline installer. Launch Options: diablo-1-free-download-pc-game-full-version
This is the official digital release. It includes the original 1996 version (with Battle.net support) and a "DX" version optimized for high-resolution displays and modern hardware. Usually around $9.99. Features: Cloud saves, bug fixes, and no need for a CD-ROM. 2. Diablo 1 Web Browser Version
💡 If you're looking for the Hellfire expansion , it is included for free with the GOG version of the game!