Windows 10: My Windows Update Assistant is stuck at 99%, please help if possible.

I have been running the windows update manager to get the new May 2019 update (version 1903) as I am currently on 1803, while checking for updates, my device would always never finish the task. So, I looked around at some threads and saw that I could manually download the May 2019 update for Windows 10 using the Windows Update Assistant. So, I downloaded and ran it, and there were no issues with that at all. Everything worked fine until it hit 99%. I have patiently waited for 5 hours hoping it would finish because that is what some answers on here said to do, and I had no luck, it is still stuck on 99%. I read more questions and answers and I wanted to make sure I would not mess up my device by following a thread here, I was wondering if a Microsoft Assistant could give me help on what to do to stop it and try again.


More Important Info:

I have been using McAfee Livesafe and it gets stuck at 50% on the vulnerability scanner always at "Checking: Windows". I am assuming there is some form of loop going on that is screwing up all Windows updates on my device and I would like more information.


Any advice helps, I am only taking advice from certified community helpers.

-Blizzard

:)

 

Windows 10 Update Assistant stuck at 99%

Hi,

There's a possibility that the issue you're experiencing with the Windows 10 Update Assistant is due to a corrupted update file. To help you rectify the issue, please follow the troubleshooting steps present in this
support article. The link has instructions
on how to troubleshoot the exact issue you're experiencing on Windows 10 Update Assistant.

Please respond back with the results.

 

Your device needs the lastest security updates stuck at 99%

Hi Thamonwan,

It is possible that the issue is caused by corrupted system files. To resolve this issue, we suggest that you follow the steps outlined in the support article:
Windows 10 Upgrade Assistant is stuck at 99%.

Note: Follow these steps before you restart your PC. Otherwise, the Media folder might not be available.

Hope this information helps. Update us with results for further assistance.

 

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<br>
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<br>
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.