Windows 10: W10 update from 1803 to 20H2 fails

I have tried all the measures described in the various topics and cannot get the upgrade to work

The last attempt was via ISO downloaded from MS. Final option option is to wipe and reinstall but I'd like a solution if possible

I have the required logs


Full install failed - 0x8007042B - 0x4000D

Install failed in the SECOND_BOOT phase with error during MIGRATE_DATA operation


OS Name Microsoft Windows 10 Pro

Version 10.0.17134 Build 17134

OS Manufacturer Microsoft Corporation

System Manufacturer LENOVO

System Model 10T7S00800

:)

 

Cumulative update KB4598242-OS Build mismatches-W10 20H2

This is what I've done to date.

1- downloaded the update reset batchfile from the source given, and run it.
2-immediately rebooted the machine
3-downloaded the relevant ssu, although this is listed as installed in Control Panel > Programs. Running that msu confirms that it's already on the system.
4-downloaded the KB4598242 msu from Microsoft, and run it. It started Ok but failed with the same error 0x8007000D
5-checked with sfc /scannow - no problems reported.

In other words, I've stepped through the suggested processes, but still end up with the update failing to install, and with the same error as when update attempted through WU.

I may try the whole process over again, before attempting anything else.

 

Cumulative update KB4598242-OS Build mismatches-W10 20H2

ASUS Vivobook running Win 10 20H2 Home - OS Build 19042.685 (per winver)

WU offers, downloads and then installs KB4598242, and then fails with a "files missing or similar (my recall)-will try again" plus error code 0x8007000D.

I tried letting WU rerun it, same problem, and also cleared SoftwareDistribution and catroot2 folders, then rerunning. Same problems, same error.

The KB4598242 is listed on MS as being for W10 20H2, and for OS builds 19041.746 and 19042.746 - which aren't my build of 19042.685. I guess this may be why it doesn't install!

Any suggestions as to how I deal with this, including blocking this from WU?

Edit
I have removed SoftwareDistribution folder etc. which has of course removed the failed update from Update History. However, looking at Updates via Control Panel, I see an update KB4599841 Security Update, same date as first failed install of the other KB..242 (18/1), but this Security Update doesn't appear in Update History, though the MSRT on same date does, under Other Update.

 

Windows 10 fails to update


When you finish testing the Avast suggestion, make sure that you restart your machine.

Then if the issue persists, please return to the trouble shooting list in post# 89

I think there are three steps that remain; the WU troubleshooter, reset WU components, and manual WU reset.