Sorry about the delay, but I had limited windows in which to test this on two of the three affected servers and just finished last night. To reiterate for clarity, no, I do not have ESET Inspect/EDR running in this environment. Only the Mgmt Agent and Server Security are on each system.
I did exclude the MUI extension in the real-time protection setup and attempted the upgrade from v8.0.12013.0 to v9.0.12012.0 again on all of them. This time they all succeeded. What I don't know, however, is if that was just a fluke or not. I had not attempted any of those updates again before excluding that extension to see if they failed again. So in short, I would say it's a qualified yes that it made a difference.
I still have a six servers to go. I've modified the bootmgr setup on the remote ones to enable F8 on boot in case there are any more problems so I don't have to have someone physically there to aid in recovery. If I do encounter any more problems (which at this point, would be with the MUI exclusion in place), I'll let you know in this thread. The rest of them will be done by this weekend.
