With the launch of the Call of Duty 21 (COD 21) free week, countless FPS gamers are gearing up for this shooter feast.  Some players are still unsure how to participate in the Call of Duty 21 free trial.  Here’s a guide on how to download and install Call of Duty 21 during the free week.

**I. Preparation before Downloading**

1. **Check System Requirements:** Before downloading Call of Duty 21, ensure your PC or console meets the minimum system requirements. This includes hardware like processor, RAM, and graphics card, as well as software like operating system and hard drive space.

2. **Register and Log in to the Gaming Platform:** Call of Duty 21 is available on multiple gaming platforms, including Battle.net, Steam, and Xbox Game Pass. Determine which platform you want to download the game on, register an account for that platform, and log in to proceed.

3. **Prepare Lagofast Game Booster:** Since Call of Duty 21 is an overseas game, players might experience network latency and lag. Lagofast game booster is recommended to optimize the network connection for smooth downloading and gameplay. In the Lagofast client, click "Redeem Code" and enter "Lagofast好用" (Lagofast is good) to claim free acceleration time.

**II. Download Steps**

1. **Open the Gaming Platform:** Log in to your registered gaming platform account, such as Steam.

2. **Search for Call of Duty 21:** Search for "Call of Duty 21" or "Call of Duty 21: Black Ops Cold War" (Note: COD 21 is Vanguard, not Black Ops Cold War. The original text has an error.) within the Steam platform.

3. **Click Download:** After locating the game, you should see the free trial offer where you would normally purchase the game. Click "Play Game" to add it to your library, and then you can click the "Download" button to begin downloading.

The above is how to download Call of Duty 21 during the free week.  This guide shares the method for free play.

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