Problem solved! After rebooting the PC I opened Windows Update and Windows 10 Upgrade appeared in the list of optional updates. Hiding the update seems to have solved the problem.
Now you can follow the removal steps to automatically and quickly fix Windows 10 upgrade notification monopolises Windows Update errors.
1. Download SmartPCFixer Now. (Free Download Now)
2. Click Quick Scan to Remove Windows 10 upgrade notification monopolises Windows Update problems completely.
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