Windows 10: [HELP] Update to 2004 stuck at 99% via Update Assistant

I'm using the Update Assistant to update my laptop, and the update is always stuck at 99%. I've been attempting to do this for a week already.

I've tried running it overnight, clearing out the downloaded updates using Disk Cleanup, Windows Troubleshooter. None helped.

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:)

 

Windows 10 upgrade assistant stuck at 99%

Here is what I've learnt about upgrading to Windows 10, in the past few days.

Media Creation Tool

The good thing is that the upgrade completes smoothly once the download has completed.

The bad thing is that it doesn't resume interrupted downloads. The download is over 3GB which is almost 3x the amount downloaded by UpgradeAssistant.

Common Problems

Once interrupted (esp. crashed or rebooted) you won't be able to launch the tool again without manually deleting the $Windows.BT and $Windows.~WS folders first. However, in order to delete these folders you'll need to use Process Explorer (from sysinternals) and forcefully close all open handles to files in these folders. Search for "$Windows." and close every handle that you find.

In my case, after each interruption (I had four) it would add 3.02GB to the download - basically start downloading +1 BITSXYZ.tmp files. With 5 downloads of over 15GB I had to say goodbye to this method as nothing I did could reset the tool to its initial state.

Don't use this method unless you have a reliable power-source and good internet.

Upgrade Assistant App

Very good at resuming broken downloads and it downloads only what is needed for your system therefore a much faster method. The downside is that the upgrade isn't a smooth process.

Common Problems

Upgrade will get stuck at 99% and there doesn't seem to be a single solution that works for everyone. First, its better to resolve missing driver issues before upgrading (as suggested by other answers). Here is what I did to get past 99%.

1. Let it run for sufficiently long time say 3 hours.
   
2. Set startup type for the windows service: "Windows Update" to "manual" for the duration of the upgrade, this will prevent it restarting itself when you perform the next step.
   
3. Stop the windows service: "Windows Update" and wait a couple of minutes
   
4. If this doesn't help start the service again.
   
5. Use process-explorer to kill SetupHost.exe that is a child of WindowsUpgradeAssistantApp.exe.
   
6. Wait for the assistant to report "Something went wrong," and use the "Try Again" option. This should repeat the usual download, verify and install cycle except that at about 45% a blue interface will popup.
   

The new popup UI will start in "Getting Updates," phase and believe it or not there are far more reported incidents of that getting stuck. To resolve it:

1. Stop "Windows Update" service
   
2. Clear all contents of "C:\Windows\SoftwareDistribution"
   
3. Start the service again (if needed).
   

This should hopefully unblock the tool, but it will come back to the "Getting Updates" state again. Give it some time and if it gets stuck again, follow Step 1 and 3-4.

Once past this point the "real upgrade" would begin and hopefully that would be a smooth process.

 

Windows update stuck at 99% after restore! (Help)

After trying for days, with several methods, THIS WORKED for me!!!
I found it under Settings, Windows Update, "get Help"
Please note, I was stuck on Version 1703 OS Build 15063.966

Windows 10 Upgrade Assistant is stuck at 99%



If the progress of Windows Upgrade Assistant is stuck at 99% for more than four hours, here's something you can try. Note: Follow these steps before you restart your PC. Otherwise, the Media folder might not be available.

• Open File Explorer, type C:\$GetCurrent, and then press Enter.
• Copy and paste the Media folder to the desktop. If you don't see the folder, select View and make sure the checkbox next to Hidden items is selected.
• Restart your PC, open File Explorer, type C:\$GetCurrent in the address bar, and then press Enter.
• Copy and paste the Media folder from the desktop to C:\$GetCurrent.
• Open the Media folder, and double-click Setup.
• Follow the instructions to start the upgrade. On the Get important updates screen, select Not right now, and then select Next.
• Follow the instructions to finish upgrading to Windows 10. After it's done, make sure to install available updates. Select the Start button, and then select Settings > Update & security > Windows Update > Check for updates.

 

Windows Updates stuck at 99% for 5 hours

Hi,

As you are facing issues with installing updates which stuck at 99%. Do not worry we will help you with this issue.

• Do let us know if you are able to see any error code / error message with this issue?
• Are you referring to installing updates on Windows 10/ upgrade to Windows 10 from previous operating system?

I suggest you to refer to the below post replied by Arvind Ram
on July 21, 2016 and check if it helps.

Windows 10 Upgrade Assistant is stuck at 99%

Hope it helps. Update us the status of upgrading to Windows 10 for further assistance.

Thank you.