How do you download diablo2 Expansion without disk?

To download the Diablo II: Lord of Destruction expansion without a disk, you can purchase it through Blizzard's Battle.net platform. First, create a Battle.net account or log in to your existing account. Once logged in, navigate to the Diablo II section in the store, purchase the expansion, and follow the prompts to download and install it directly to your computer. Make sure you have the base game installed, as the expansion requires it to play.