Tried the update process again yesterday, 28th(not followed the latest suggestion from Wolfie yet) I am posting setupact results here...
2018-12-28 05:55:27, Info UI Determining whether we should run ConX or legacy setup
2018-12-28 05:55:27, Info UI Legacy setup.exe doesn't exist. Continue to run ConX setup
2018-12-28 05:55:27, Info UI Initializing Media class driver for audio support
2018-12-28 05:55:27, Info UI Initializing media class driver status: 126
2018-12-28 05:55:27, Info UI Launching ConX setup experience
2018-12-28 05:55:27, Info UI Inspecting ConX Setup Cmdline
2018-12-28 05:55:27, Info UI Launching C:\$GetCurrent\media\Sources\SetupPrep.exe /migchoice upgrade /showoobe none /Compat IgnoreWarning /eula accept /noreboot /postoobe C:\$GetCurrent\SafeOS\SetupComplete.cmd /CorrelationVector IoBK0Sv2WUyCgoR5.999 /ClientId Win10UA:VNL:URL:9252:<1.4.9200.22589>:<1>:{5A87637E-0289-4E13-8514-184BEE1B76EB}:[10.0.17134]:[2] /DynamicUpdate Enable /telemetry enable /UpdateMedia Decline /SkipSummary
[12/28/2018 06:31.35.975] WudfCoInstaller: ReadWdfSection: Checking WdfSection [Basic_Install.Wdf]
[12/28/2018 06:31.36.288] WudfCoInstaller: UMDF Service WpdFs is already installed - removing existing settings in preparation for setting new ones.
[12/28/2018 06:31.36.413] WudfCoInstaller: Configuring UMDF Service WpdFs.
[12/28/2018 06:31.36.475] WudfCoInstaller: ImpersonationLevel set to 2
[12/28/2018 06:31.36.553] WudfCoInstaller: Final status: error(0) The operation completed successfully.
[12/28/2018 06:31.37.444] WudfCoInstaller: Created marker file C:\WINDOWS\system32\drivers\Msft_User_WpdFs_01_11_00.Wdf.
[12/28/2018 06:31.38.456] WudfCoInstaller: ReadWdfSection: Checking WdfSection [Basic_Install.Wdf]
[12/28/2018 06:31.38.506] WudfCoInstaller: UMDF Service WpdFs is already installed - removing existing settings in preparation for setting new ones.
[12/28/2018 06:31.38.550] WudfCoInstaller: Configuring UMDF Service WpdFs.
[12/28/2018 06:31.38.606] WudfCoInstaller: ImpersonationLevel set to 2
[12/28/2018 06:31.38.656] WudfCoInstaller: Final status: error(0) The operation completed successfully.
[12/28/2018 06:31.38.916] WudfCoInstaller: Created marker file C:\WINDOWS\system32\drivers\Msft_User_WpdFs_01_11_00.Wdf.