The Battle.net app usually handles updates automatically. However, if you are installing from old CDs, you must patch the game.

Diablo II was built for Windows XP/98. It often crashes on launch for modern users.

Whether you own the game or are using the Starter Edition, follow these steps to ensure the game runs correctly on modern Windows (10/11).

Here is the nuance that most guides miss. There is a legal way to get the LoD installer for free if you want to play specific mods.

Massive mods like Project Diablo 2 (PD2) , Median XL, and Path of Diablo have legal arrangements with Blizzard because they require users to own a legitimate CD key. However, these communities have created "Custom Launchers."

Is this legal? Grey area. Technically, the data files are Blizzard's IP. Practically, Blizzard has turned a blind eye to single-player modding for years because it keeps the classic community alive.