The download only contains an incremental update to the actual product, which has to be acquired separately.
Diablo 2 Patch 1.09
From Blizzard Entertainment:If you have installed the Diablo II: Lord of Destruction expansion, download and apply the Lord of Destruction patch (Windows| Mac).If you have not installed the Diablo II: Lord of Destruction expansion, download and apply the Original patch (Windows| Mac). Blizzard Diablo II Patch; Blizzard Diablo II Patch for Mac Free. The download only contains an incremental update to the actual product.
Diablo 2 Updates And Patches
Since the beginning of time, the forces of Order and Chaos have been engaged in an eternal struggle to decide the fate of all Creation. That struggle has now come to the Mortal Realm...and neither Man, Demon, nor Angel will be left unscathed... After possessing the body of the hero who defeated him, Diablo resumes his nefarious scheme to shackle humanity into unholy slavery by joining forces with the other Prime Evils, Mephisto and Baal. Only you will be able to determine the outcome of this final encounter... In Diablo II, return to a world of dark fantasy. As one of five distinct character types, explore the world of Diablo II -- journey across distant lands, fight new villains, discover new treasures, and uncover ancient mysteries, all in the quest to stop the Lord of Terror, once and for all...