If you are stuck on this screen or seeing it too often, use the following verified methods to get back into the Koprulu Sector. 1. Fix Language Mismatches (Most Common Fix)
The "Preparing Game Data" window in StarCraft II is a pre-launch process where the Battle.net launcher verifies local files, streams missing assets, or downloads small localized patches before the game client fully opens. While often a standard verification step, it can become a "loop" where the game tries to download hundreds of megabytes every time it is launched. starcraft 2 preparing game data verified