Outdated, corrupted, or missing Battle.net® folders or files can cause issues with the launcher and game clients. In order to resolve these issues use the following steps:
Note: The above steps may cause Battle.net to forget game install locations. If your games can’t be found, you will see Install on the Battle.net game tab instead of Play. To find your installation, click Locate this game or run the game launcher.
Article ID: 6504