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Select System and Security and after that select Windows Update and then click on Change Settings. The steps how to disable Windows Update are: Here we will deactivate the Windows Update for some time. So relax and try this approach, maybe it will help you. If above-given methods didn’t help you and the windows 10 upgrade assistant stuck at 99 percent error is still irritating you. Fix 3 – Temporary Deactivation of Windows Update After restarting your system, try the Windows update process again, and we hope now it will not give you an error like windows update stuck at 99 percent.
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