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It seems to be a known issue, the most effective method now should be in-place upgrade by an iso image.
Try to download media creation tool from Microsoft website by click Download tool now button
https://www.microsoft.com/en-us/software-download/windows10
Next, choose ISO file option in Windows 10 setup interface. After iso file download complete, do the following steps:
1.disable completely the internet on the computer
2.disable all security software
3.clean boot the computer
4.install iso wait for upgrade