Horizon Forbidden West™ Complete Edition | CIS

Make sure the country in your Steam account settings is one of the following: Armenia, Azerbaijan, Belarus, Georgia, Kyrgyzstan, Kazakhstan, Moldova, Tajikistan, Turkmenistan, Ukraine, or Uzbekistan. The key will not activate on an account with a different region.

Via the Steam client: launch the client on your computer and sign in to your account.

In the top menu, open the "Games" section and select "Activate a Product on Steam…".

Follow the wizard's prompts: accept the user agreement, enter the key from the email, and confirm. The game will appear in your library and be ready to download.

Via a browser: open store.steampowered.com/account/registerkey and sign in to your Steam account.

Enter the key in the field on the page and follow the prompts to complete activation. The game will be linked to your account and appear in your library.