Sadly to report that the Upgrade with internet disconnected ends with another failure.
After installing up to 87%, a BSOD appears with stop code "Kernel_Mode_Heap_Corruption", then the system goes to the previous start-up.
The stop code for the first trial is "Kernel_Security_Check_Failure".
The gold standard Clean Install appears to be a complete new installation of Windows OS, removing all apps and data. It will then be a time consuming process to resume the system to its current status. Also, I feel puzzled with the steps for drivers, everything in the Device Manager screen appears to be normal, but the stop codes encountered appear to point to driver problems.
What I worry most is the possible modification of BIOS firmware, this step frightens me as I'm not confident to touch the BIOS, with the understanding that any slight issue during BIOS firmware may lead to serious problem.
My desktop can now serve my daily use, what I will lose in its current status is the connection of Bluetooth devices even with my newly procured Bluetooth adaptor.
Unless there is any other less time consuming and less risky way to solve the bottom right icons issue, I may stop my attempt right here.
Anyway, thanks Greg for your patient guidance so far in the journey.