It fails to download the contents even though I tapped on the download button at the "New Contents" screen.

Please confirm that the situation would be improved or not by the following actions.
-Change the network type (wi-fi / 3G / 4G/LTE)
-Version up the app to the latest one
-Delete the app once then install it again
-Remove the activation of the app on the CMS, then login again, or change the device to use