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Most users will use Windows Update to perform an upgrade to Windows 10.
The Upgrade Assistant might become non-responsive at a certain point. We are aware that a set of users are reporting a slow or seemingly-stuck upgrade experience when attempting to upgrade to Windows 10 or update between versions of Windows 10.
If the problem persists, then manually modifying the software distribution folder might be worth a try.
If these instructions prove too cryptic or difficult to attempt, then switch to using the media creation tool or ISO to upgrade.
The ISO file used to create the install media might also be corrupt.
Press Windows key R then type: might occur if your master boot record is corrupt.
The MBR contains the boot information for the operating system.
Users can try using their Windows 7 or Windows 8/8.1 install media to perform a system repair.
If performing a system repair does not work, backing up your personal files, then performing a clean install is probably best.