To download Call of Duty, follow these steps:

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1. Choose a Platform: Decide which platform you want to play Call of Duty on. It's available on various platforms like PC, PlayStation, Xbox, and sometimes even mobile devices.

2. Go to Official Store: Visit the official store for your chosen platform. For example, if you're on PC, you might use the Blizzard Battle.net launcher; for consoles, you'd use the PlayStation Store or Xbox Store.

3. Search for the Game: Use the search bar within the store to find "Call of Duty." Make sure you specify the specific title you're interested in, as there are many different Call of Duty games.

4. Purchase or Download: If the game requires a purchase, proceed to buy it using the available payment methods. If it's a free-to-play game like "Call of Duty: Warzone," you can usually just click the "Download" button.

5. Install the Game: After the download is complete, follow the prompts to install the game on your system. This might involve agreeing to terms of service, choosing installation location, and waiting for the installation process to finish.

6. Updates: Depending on the game, there might be updates that need to be downloaded and installed before you can play. These updates are important for bug fixes, new content, and improvements.

7. Launch the Game: Once everything is installed and updated, you can launch the game from the platform's launcher or your console's menu.

8. Account: If the game requires an account, you might need to create one or log in with your existing account.

Remember that the exact steps might vary based on the specific game you're trying to download and the platform you're using. Always make sure you're downloading from official sources to ensure your security and to avoid pirated or fake versions of the game.