Fix Windows 10 Upgrade Assistant Stuck at 99 {2 Ways}


Windows 10 Upgrade Assistant Stuck at 99 is a general issue in Windows 10. But don’t worry as we have 2 Ways to Fix Windows 10 Upgrade Assistant Stuck at 99. After following one of these ways, you will be able to overcome this problem.

windows 10 upgrade assistant stuck at 99
Windows 10 Upgrade Assistant Stuck at 99

I still remember the day when I received the notification of an update available to Windows 10. It was back when the OS was new on the market, and it was all the news as to who gets it on their PCs first. But it is also the time when a bevy of new bugs and classic windows annoyances made their appearance. One such issue with Windows 10, or at least the software relates to that operating system, is windows 10 upgrade stuck at 99 percent.

The only thing worse than a file download failing at 99 percent, is when the download gets stuck at 99 percent. What do we suppose to do in that situation anyway? Wait for it and pray that it completes, or click cancel and start the whole download from scratch? The mere thought of having to download all those MBs again is the stuff of internet users’ nightmares.

If you’ve experienced this issue where windows 10 upgrade stuck at 99%, then this article is just the therapy you need. No, you won’t find any dank memes here to cheer you up, but I’ve listed two possible solutions to the problem instead. Before we proceed ahead to solve it, let us go over why the updater gets stuck at 99 percent in the first place. Why should you read it? Because I feel like writing, that’s why.

See Also: Should I Delete Windows Setup Files? (10 Step Guide)

Possible Reasons Behind the Windows 10 Upgrade Assistant Stuck at 99

This problem could’ve been due to one or more of the following reasons:

  1.  A virus or Trojan
  2.  System boot partition failed to abide by the new patches
  3.  Download errors
  4.  Damaged/corrupted file.

Also, Fix – 

2 Ways to Fix Windows 10 Upgrade Assistant Stuck at 99

To fix the windows update assistant stuck at 99 percent error, follow these methods. One of them will surely help you out to fix this issue.

Method #0 Use Advanced System Repair Pro (Strongly Recommended)

Our tool will quickly repair common computer errors, protect you from file or data loss, malware, trojans, hardware failure and optimize your PC to boost for maximum performance. Fix PC issues now using 3 easy steps:
  • Download this PC Repair Tool rated as "Excellent" on
  • Click on Start Scan button to find errors related to Windows.
  • Click Repair All to fix all issues with Patented Technologies.

Method 1: Use a system partition manager

An efficient way to try and tackle this error is to load your system in an extended drive space using any capable partitioning tool. The built-in disk management serve of Windows OS is good enough for basic tasks, but may not serve our purpose well in this case.

Soo, I suggest getting something like EaseUS partition master. I have been using it for a long time now, and it’s excellent. Here is a download link if you want to check it out.

It is a trial version, but it can get the job done just fine. So, if you don’t have anything better, go ahead and download it to your PC.
Now that you have the partition tool installed, we can proceed to check and fix your system errors. Read this article about how to fix the taskbar won’t go away issue.

  1. Launch the Easeus Partition Master Tool and select the partition you want to check. Right-click on that partition and select the Check partition option.
  2. Now, you choose the way in which you want to check the selected partition. You are given three checkboxes, namely, Check Partition Properties, Call Windows Chkdsk to fix errors and Surface Test. Check all of them and click OK.
  3. The partition master will now check the drive for any irregularities and correct them using standardized formats. After the process is done, just click OK.
  4. You now need to extend your system to another available drive. To do that, right click on the partition where have installed your OS. That would be the C drive, in case you didn’t know. Select the Resize/Move partition option from the right-click menu. Now, click and hold the slider and slide it towards the right of the bar. It will increase the volume space on the C drive.
  5. After you are done, click on the Apply button on the top left option to finalize the changes. That’s part of why I use the EaseUS software. They allow you to make all the changes beforehand and apply them at once.

Your computer will now shut down, enter unto the Easeus master boot mode, and begin all the volume extensions. You don’t have to do anything, just wait patiently until it is done. It will reboot twice, so make yourself a cup of tea while it does its thing. Surely this will resolve windows 10 stuck at 99 issue.

Check Out: 

Related Error: How to Run Chkdsk In Windows 10

Method 2: Download and flash an ISO

I sincerely hope you are not a stranger to the term ISO. It is an image file using which you can flash an operating system onto an HDD or a bootable USB drive.

Check This Also: 7 Best USB Bootable Software for Windows

So, if the above method did not fix the Windows 10 update assistant stuck 99% issue, then try to flash the Windows 10 OS directly. Here is how you can do that.

  1. Head over to Microsoft website and grab yourself an ISO copy of Windows 10 (32/64 bit). Here is the link for your convenience.
  2. Backup your essential data from the PC to another external drive, just in case something goes sideways. Windows installs are usually very easy and hassle-free, but it is always good to prepare oneself for the worst.
  3. If you have any antivirus software installed, which I’m assuming that you do, consider disabling it until you have installed the update. Restart your computer for good measure before installation.
  4. Run the ISO file that you downloaded to begin installing Windows 10 OS. Just follow the simple instructions on the screen and carry on with it.

If it does not work directly, you can always download the update using a windows flash tool, such as a media creation tool. Here is a link to the exe file, for your convenience.

Just run it and select the Upgrade this PC now option. It will automatically start downloading Windows 10 and proceed to install it. You can also check if Windows Update Service Not Error is interrupting you or not.

Also Read:


I know, this method defeats the entire purpose of you downloading the update via the Windows 10 updater in the first place. That is the sad part. No one likes to be hanging at 99, but hey, at least you get Windows 10 working now! Lastly, you might want to also check if Windows has detected a Hard Disk Problem because that could be the reason as well.

Just grab a product key from a pirate site, and you’re good to go! But if you get in trouble for piracy, you did not read this line. Cheers!