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From Diablo Wiki
→Unlocking the Undocumented Features
You must have hellfire installed on your machine before any of the following will do you any good. We do not have information about where you can obtain Hellfire. Neither Sierra nor Blizzard sell it through their online store, it is not part of the Diablo Battlechest, and few stores will have the game in stock at this time. You can find used copies through Amazon.com and other game retailers, but they are usually expensive. Checking ebay.com might be your best bet, or finding a friend who owns it who would let you borrow it. You do not need the Hellfire CD to run the game, once it's installed.
# [http://www.diii.net/files/hellfire-all.zip Download this file] (640k, zip) hosted by the Unofficial Diablo Site. It contains Sierra's official Hellfire v1.01 patch (also can [ftp://ftp.sierra.com/pub/patches/pc/hf101.exe be downloaded directly] from the Sierra site), the hacked hellfrui.dll you need to enable multiplayer in Hellfire v1.01, and the command.txt file. (The info.txt file in the zip duplicates these installation instructions).
# Open the zip and run hf101.exe to upgrade to the Hellfire v1.01 patch.
# Extract hellfrui.dll and command.txt to your hellfire folder (C:/sierra/hellfire by default).
