To download and feature the Diablo 2 Fury Within mod (Ancients: The Fury Within), you must typically use a version of the original Diablo II: Lord of Destruction patched to The Phrozen Keep Download & Installation (2021/Current)
Here is the exact process that worked for players as of November 11, 2021.
The version 1.09 is critical because later Diablo 2 patches (1.10, 1.11, 1.13, etc.) changed the game’s core mechanics, including synergies and monster AI. The Fury Within only functions correctly on 1.09d.
Match Versions: Ensure your Diablo 2 installation matches the mod's required patch (either 1.09 or 1.10)