I found an SEP_Inst.log file, on one of the computers, but the only entries in the log were from the original install of MR4, back in June, 2009. And the event log does not show any recent MSIInstaller errors.
When I look at the Client-Server activity system log on SEPM console, I do see
Client has downloaded auto-upgrade events for both clients this morning, but on the client I am looking at right now (I won't have access to the other one until tomorrow morning), there are no corresponding events in any of the logs I checked.
I should mention that neither of these machines is completely typical. One of them (the one I just looked at) is running the SEP manager, as well as the client I'm trying to update. The SEP Manager
did upgrade successfully, without any problems. The other client is on a 64-bit machine, running Windows 7. Are either of these characteristics significant, as far as auto-upgrade from MR4 to RU5 is concerned?