All Yuzu eBooks purchased through BN College websites or Yuzu.com you must use one of the Yuzu eReader Apps.
Publishers of print textbooks also create its eBook counterpart. When distributing eBooks, publishers require DRM (Digital Rights Management) protections. Each retailer selling eBooks must have an eReader App available that manages the eBook license and secures the content.
You cannot download Yuzu eBooks independent of the Yuzu Apps.