The original Diablo is Freeware or Abandonware. Sites offering "Diablo 1 Free Full Version" are often:
You can actually play the original game directly in your browser. Rivsoft
You can play the Shareware (demo) version for free instantly.
These may contain malware or "cracks" that trigger antivirus software.
💡 If you're looking for the Hellfire expansion , it is included for free with the GOG version of the game!
To play the original on a modern PC, you have two primary options: purchasing a digital copy optimized for modern systems or using the "Shareware" version available for free.
Choose this if you want the "authentic" 1996 experience.
If you own the original DIABDAT.MPQ file (from a CD or the GOG install), you can drag and drop it into the browser window to play the full game there. 3. DevilutionX (Modern Engine)