1. Go to Control Panel –> uninstall the WowApp, during the uninstalling process, mark the Delete user settings option.
2. In Windows Explorer and insert in path %LOCALAPPDATA% and remove folder WowApp (if it's still there).
3. Access the WowApp website, log-in if needed – go to Support – download the latest version for windows. Direct link : https://www.wowapp.com/support/download.
4. After the install is done, launch the app, insert your credentials and press Sign in.