While usually seamless, this step can sometimes fail. A thread on the official Blizzard forums outlines a scenario where the download would progress partially, drop to 0 MB/s, and then display a server download error.
If the previous steps fail, the underlying Battle.net Update Agent software may be corrupted beyond a simple cache clear.
If the issue is corrupted core files, a self-repair can save a full reinstall. starcraft 2 preparing game data link
The Battle.net app caches game data to load faster. If this cache becomes corrupted, the app gets stuck "preparing" data that doesn't exist.
If you previously switched your game's language profile, the asset streaming link can break internally. Go to via the gear icon in Battle.net. Click Modify Install and select Change Languages . While usually seamless, this step can sometimes fail
Corrupted cache data can prevent the "Preparing" stage from finalizing. Close Battle.net completely. Press Windows Key + R and type %ProgramData% . Delete the Battle.net and Blizzard Entertainment folders. Restart Battle.net and attempt to launch the game. 4. Bypass Battle.net Launcher (Direct Launch)
How to Fix the "StarCraft 2 Preparing Game Data" Stuck Error: Complete Troubleshooting Guide If the issue is corrupted core files, a
Corrupted temporary files are the most frequent cause of initialization loops. Deleting these files forces the Battle.net launcher to rebuild its data structure from scratch. Clear the Cache Folder Press to open the Run dialog box. Type %programdata% into the field and press Enter . Locate the Blizzard Entertainment folder. Right-click the folder and select Delete . Clear the Files Folder Press Windows Key + R again. Type %localappdata% and press Enter . Find the Battle.net folder. Right-click and Delete it. Restart your PC and relaunch the Battle.net application. 2. Run Battle.net as an Administrator
StarCraft II saves your variable configurations, replays, and login profiles in your local Windows Documents directory. If you use cloud storage software like Microsoft OneDrive to automatically sync your documents, it can lock the files and prevent the game client from accessing them.
Knowing this can help narrow down if it's a corrupted file or a server-side issue. Share public link
