Hi H_K,
With these major upgrades, the most successful method is to upgrade from the Windows 10 ISO - you download the ISO and then perform an Offline Upgrade
Click this link:
https://www.microsoft.com/en-us/software-downlo...
to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), then choose ISO
When the ISO file completes downloading
Disconnect from the Internet
Uninstall any 3rd party Anti-virus - this is a known issue with 1803
Then, double click it and then run Setup.exe to begin the upgrade . . .