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A known issue sometimes causes the Battle.net app to constantly re-update small amounts of data (often around 137MB).
It checks the integrity of game files on your disk and compares them with Blizzard’s servers to ensure the client is up to date. On-Demand Streaming: starcraft 2 preparing game data
: Changing the game's text or audio language (e.g., from Russian to English for custom campaigns) frequently causes the client to re-download the same ~600MB of "game data" at speeds far below the user's actual bandwidth. A known issue sometimes causes the Battle
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If you are experiencing this issue persistently, try the following verified community fixes:
: Residual files in the Battle.net cache or the game's configuration folder can trick the launcher into believing the game is perpetually out of date.
Third-party antivirus programs or Windows Defender are mistakenly blocking the Blizzard Update Agent ( Agent.exe ).