Step 1: Launch the Steam client software, then log into your Steam account. Click the “Create a new account” button to register a new account if you are a new Steam user.
Step 2: Click Game Menu.
Step 3: Choose "Activate a Product on Steam".
Step 4: Then follow the onscreen instructions to complete the activation to enjoy your game.
This Counter-Strike: Global Offensive Prime Status Upgrade Key can only be activated and run in countries such as Malaysia, Singapore, Philippines, Vietnam, Indonesia, Cambodia, Brunei Darussalam, Thailand, Myanmar, India, Turkey, Lao People's Democratic Republic, United Arab Emirates, Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, Australia, Hong Kong, Taiwan, Sri Lanka, Pakistan, Nepal, Republic of Korea, Macau, China and Bangladesh.
If you are not from any of these countries, the workaround method is to use VPN that connects to these countries.
You may purchase it here, Counter-Strike: Global Offensive STEAM.
Visit the SEAGM Support site for quick answers and guides.