You can upgrade to 3.10 from an existing ESRS VE install through the GUI.  It's possible the option was not showing up there for you earlier.  The 3.10 patch should apply in the same manner as prior releases, starting with 3.04 using the GUI upgrade method.
Hello,  I read the EMC Secure Remote Services 3.10 Release Notes and it sounds like there is no "upgrade" path ie you cannot upload the upgrade image and apply it to the existing 3.08 virtual appliance, you have to re-deploy and re-configure it. Is there any way I can export the configuration and apply it to the new installation? Will the new VA reconnect to the EMC ESRS servers and join the cluster (I have two ESRS VA's).  Than you.  Mark Strong [URL]
ESRS VE upgrade from 3.08 to 3.10