Okay, so I think I've found a workaround.  Every time I try via the web gui to download the upgrade, it fails.  I ssh'd onto the ESRS and ran this: /opt/scripts/esrsvescript-linux/bin/downloadISO.sh The download worked (953M downloaded).  I then refreshed the web gui and the file was available to be applied.
Got the message to update to 3.40.00.08, however clicking the download button does nothing. I've tried numerous times today and after the download taking too long message and refreshing constantly the update still fails to appear as available. Any ideas?
ESRS update not downloading