If you're interested in playing StarCraft 2 offline legitimately, here’s a helpful alternative:

StarCraft 2’s single-player campaigns and vs. A.I. matches can be played offline, but you need to log in online at least once every 30 days to verify your license. Once that’s done, you can launch the game in offline mode via the Battle.net app. The game runs smoothly without an internet connection, and all your progress saves locally and syncs next time you go online. Just remember to set “Remember me” on login and use the “Go Offline” option in the app settings. For fully unrestricted permanent offline access without periodic check-ins, no legitimate method exists — but Blizzard’s system is reasonably lenient for most players with intermittent internet.

that allows you to play the campaign and certain custom games without needing a "crack" or third-party bypass. Method 1: Official Offline Mode (No Crack Required)