If you have a subscription, the StarCraft II: Campaign Collection is included with PC Game Pass, giving you access to all expansions. What is Included for Free?
The game is well-optimized and can run on most modern computers, including many with integrated graphics. StarCraft II
You must download and install the Battle.net desktop app to manage the game files and updates.
Find StarCraft II in the "Games" tab of the Battle.net app and click "Install".
Complete access to the Unranked and Versus A.I. modes. Ranked ladder play is unlocked after your first 10 wins of the day.
To download and play on your PC today, you can get the base game for free directly from Blizzard's official platform. How to Download StarCraft II
Go to the StarCraft II Official Website and click "Play Now".
You can play the entire "Wings of Liberty" (Terran) campaign at no cost.