To play Diablo 3 offline you need to patch the game using this tool created by team null

Instructions:

1) Install the game.
2) when it ask for the CD key open the crack and click patch.
3) after the installation is finished close everything and reopen the patch and patch again.
4) Done! You can now play offline.

Note: To use this emulator you need Microsoft .NET Framework, Download it here.
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