Once inside the game, you can check the "Campaign" tab to see if you have access to Heart of the Swarm or to purchase it securely if you don't.
While searching for free game downloads like on third-party sites can be tempting, it is important to know that StarCraft II is officially free-to-play through Blizzard Entertainment. starcraft-2-heart-of-the-swarm-free-download-pc-hienzo-com
The full first campaign is completely free. Once inside the game, you can check the
You can play Unranked and Versus AI for free, and all Co-op Commanders are free up to level 5. Once inside the game