Downloading Starcraft

From Battle.net

1. Goto https://us.battle.net/login, or replace us with the letters of your continent, such as eu or kr.
2. Sign up or log in if you already have an account
3. Add your StarCraft CD-Key
4. Download the installer

The installation requires a 26 digit key which you can find if you choose to view your CD-Key on the Battle.net website.