The setupmem.dmp references the volsnap.sys (Volume Shadow Copy driver) but not a third party driver :
<snip>
C:$WINDOWS.~BT\Sources\Panther
C:$WINDOWS.~BT\Sources\Rollback
If those folders exist can you zip them up and provide via OneDrive.
I tried the update again with the suggestions from Kethtc. I had originally tried uninstalling Acronis backup (which makes use of Volume Shadow Copy) and had disconnected all external drives as suggested by martya2. All seem sensible things to try.
I still had the failure, but immediately after it had restored 1709 I looked for the two folders of interest. I copied them locally. After that I reinstalled the AV (ESET Endpoint Security) which required a restart. The restart removed the Rollback folder
and a lot of the content of the Panther folder.
I have another (much older) machine running much the same software and that upgraded OK (but very slowly) in the presence of an attached USB drive, Acronis and ESET.
I would share the folders with you, but OneDrive is playing up. I can't create shares either through the web interface or the local folder on either machine. The web interface says something about being unable to contact the server - please try later! I
wondered whether it did not like the presence of executable code in the zip file, so I removed all the .dll files that were in it - but that does not fix it.
So auggy, thanks for your efforts. When I've found a way to share the files with you, I'll do so!
OneDrive has come back to life for me so here are the folders: Removed