Repairing Battle.net Games - Blizzard Support
eu.battle.net › support › enOpen the Battle.net desktop app. Click the icon of the game you are trying to repair. Click the cogwheel next to the Play button and select Check for Updates. If your game is up-to-date and the problem persists, use the repair tool: Click the cogwheel next to the Play button and select Scan and Repair. Click Begin Scan.