Windows 10 Upgrade fails.

you need to run the advisor to make sure your system is suitable for upgrade.

What advisor

See https://support.microsoft.com/en-us/help/3159635/windows-10-update-assistant

That link brings you to the media creation tool... not an advisor.

Found an advisor... it fails stating that it cannot connect to the Microsoft server.

Is your system joined to an AD domain?

Check name servers that are being used on the system.

what pc model is this?
i would test the disk to be sure it has no bad sectors -  best use the manufacturers tool -  WD for WD drives, seagate for seagate ones - etc... ( you can download them)
i use the ubcd for this  :
Hardware diagnostic CD    UBCD
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go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, eg ubcd527.iso - so you need to use an ISO burning tool
if you don't have that software, install cdburnerXP : http://cdburnerxp.se/

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
direct download :  http://www.memtest.org/
 
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)

http://www.ultimatebootcd.com/      

**  you can make a bootable cd - or bootable usb stick
*** note *** for SSD drives  use the tool from the manufacturer, like intel 's toolbox :
https://downloadcenter.intel.com/download/18455/Intel-Solid-State-Drive-Toolbox

for completeness -here's how i handle disk problems : https://www.experts-exchange.com/Storage/Hard_Drives/A_3000-The-bad-hard-disk-problem.html

==>>****in order to be able to  boot from CD or usb - you may have to disable secure boot in the bios

I have given up on this project... wasted 13 hours. Thanks for all the assists.

looking for a solution is NEVER wasted time

Maybe frustrated would have been a better term. You'd try something out and then have to wait 45 - 60 minutes for it to look for downloads, etc.

No solution... sometimes stuff happens