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Exchange Update Errors out during install: Another Installation is already in progress. Complete that installation before proceeding with this install. Error Code is 1618.

Hi,
I'm trying to update my exchange 2016 Server from cu13 to cu15.
The first time I tried it, it stopped at step 4, with the error about being unable to start Winmgmt, or something like that.

I thought it was because I was installing this update from a different source drive, so I rebooted the server and started again, I mounted the ISO
to the E: and restarted, now I get this error:

User generated image
I've rebooted, and I've looked to see if anything is running, like an installer in task manager, and I don't see anything. I noticed the exchange services are not running.  So something is really weird.

I'll try it again, and I'll re download the ISO, maybe something is weird with it.

Any suggestions would be great.

Thank you!
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