Navigate to your StarCraft II installation folder (usually C:\Program Files (x86)\StarCraft II ). Open the Support64 folder. Run as an administrator.
Uncheck and click OK. This has been reported to instantly boost "Preparing Game Data" download speeds from KBs to MBs. Comparison of Solution Success Rates Estimated Success Language Toggle Persistent 600MB download loops SC2Switcher Bypassing launcher bugs entirely Cache Clear General launch failures or 0 B/s stalls OneDrive Unsync Stalls during the "Preparing" phase
If the launcher is the bottleneck, you can bypass the "Preparing Game Data" screen entirely by launching the game directly from its installation folder. starcraft 2 preparing game data
The most frequent cause is a conflict where the launcher thinks the game should be in one language (e.g., German or Spanish) while the client is set to another (English), causing a continuous re-download of regional assets.
Many users on the Blizzard Forums found that forcing the game to "learn" a new language and then switching back resets the check. Open Battle.net and go to . Click the Gear icon (Options) and select Game Settings . Navigate to your StarCraft II installation folder (usually
Temporary files in the Blizzard "Agent" or Battle.net cache can become stuck in a state where they never acknowledge a completed download. Step-by-Step Fixes for "Preparing Game Data" 1. The Language Toggle (Most Effective)
The "StarCraft 2: Preparing Game Data" screen is a common roadblock that occurs when the game client attempts to synchronize assets or download missing language files immediately after you hit "Play" in Battle.net. For most, it is a brief step; for others, it becomes a loop that downloads roughly 600MB at extremely slow speeds every single launch. Common Causes for the "Preparing Game Data" Loop Uncheck and click OK
A known legacy issue with the Blizzard downloader involves Windows' LAN settings. Search for "Internet Options" in your Windows Start menu. Go to the tab and click LAN settings .
Services like Microsoft OneDrive often try to sync the "Documents/StarCraft II" folder while the game is trying to write to it, causing the data preparation to stall or fail.