People still play Diablo II? They must, considering Blizzard continues to pump out patches for its eight-year old title. Whenever I start to think about how impossible this scenario is, I remind myself that people still play Solitaire too. Hey, if a game's addictive, it's addictive.
Along with a reset of the competition ladder, the patch removes the game's ancient copy protection. If this gives you any trouble, Blizzplanet has a fix that should sort you out.
Diablo II Patch Information [Blizzard]