Unable to complete Windows Updates. DISM won't run. SFC won't repair.

[RSCorpmike]

Windows 10 version 1809 - trying to update to 1909.

* Windows Updates fail (screen shot below)
* chkdsk /r finds corrupt files but cannot fix (screen shot below)
* DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:E:\sources\install.wim:1 /LimitAccess fails with error 0x8000ffff (screen shot below)

DISM log includes:
C:\WINDOWS\Servicing\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.17763.402_none_7e502ee34cd6a6f5\wcp.dll' : got STATUS_OBJECT_PATH_NOT_FOUND
C:\WINDOWS\WinSxS\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.17763.402_none_7e502ee34cd6a6f5\wcp.dll' : got STATUS_SUCCESS

Please help! Thank you.