How-To Clear or Delete BattleNET Cache: Step 1. Close open Blizzard programs. Step 2. Press Ctrl+Shift+Esc to open the Task Manager. Step 3. Click the Processes tab. Step 4. If agent.exe is running—or Blizzard Update Agent in Windows 10—select it and click End Process.
Navigate to the folder containing the cache directory: Step 4a. Press Windows Key+R to open the Run dialogue. 4b. Type %ProgramData% into the Run field and press Enter. Step 6. If a Blizzard Entertainment folder exists in the directory, right-click it and select Delete. Step 7. Restart the Battle.net desktop app and relaunch the game.