on PC is officially "always-online," several community-driven server emulators exist to facilitate offline play. However, these are unofficial third-party projects and vary in stability and feature completeness Recommended Emulators Blizzless (DIIIS)
Offline mode for legit reasons, are any cracks working? : r/diablo3 on PC is officially "always-online
Currently, there are three primary ways players attempt to play Diablo 3 offline on PC: on PC is officially "always-online
Q: Can I use the emulator with other games? A: No, the emulator is specifically designed for Diablo 3. on PC is officially "always-online
Error 3: Character gets stuck at "Requesting Authentication"