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Got confused with one of the following posts...

Could you check the event viewer log?
Maybe a broken/missing system file... (e.g. wuapi.dll)

You can also try „sfc /scannow“

aker wrote:Got confused with one of the following posts...

Could you check the event viewer log?
Maybe a broken/missing system file... (e.g. wuapi.dll)

You can also try „sfc /scannow“

Sorry, tried doing sfc /scannow and it actually did repair some errors, but it did not make a difference on this error. Still gets the same error after repairing. As for event viewer, I don't see any messages about a system file issue. Also, just to give an idea of scale, this happens on 8 workstations that I deal with. It just seems so odd that the exact same issue would happen on all of them starting at the same time.

So not sure if it is a total fix, but I found that if I run it with the /instmssl argument, it appears to run as it should. The Windows 10 systems I was having issues on had an older version of Silverlight... could forcing the install of the newer version have been causing issues with listing updates somehow? I don't know why that would be, but it definitely ran as long as I used the /instmssl argument (or ran it from the UpdateInstaller.exe and checked the Silverlight box.)

I didn't think to unininstall Silverlight entirely and then try installing without the argument though, so not sure if that would have made a difference.

For now at least, it appears to be working.

Also just to let you know - after I ran it with the /instmssl argument - I tried running it again without that argument, and it ran through fine - so whatever was causing the issue was 'fixed' by the first pass with the /instmssl argument.

Weird...