I tried to upgrade from EAP1 to EAP1 refresh 1 and from syslog.log I saw:
Oct 31 18:27:56 (none) auth.err nsgsig-verify: /sdisk/u2d/downloads/SW-18.0.0_EAP1-Refresh1.SFW-113.gpg: not an NSGSIG file
Oct 31 18:35:06 (none) auth.err nsgsig-verify: /sdisk/u2d/downloads/SW-18.0.0_EAP1-Refresh1.SFW-113.gpg: not an NSGSIG file
From the web interface or log viewer, nothing helpful.
It seams I am alone.
Regards