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[Fixed] Window 10 Upgrade Assistant Stuck at 99%

Updated on Dec 13, 2018 by Tracy King to Computer Instruction

Summary:
Unable to finish Windows 10 upgrade with upgrade assistant stuck at 99% installing? Effective methods are available here to help you fix this matter and get Windows 10 update to be installed in your PC without any problems.

According to Microsoft forum, it seems that Windows 10 upgrade assistant has caused so many troubles to many Windows users that they failed to install the downloaded upgrade from Windows 10 upgrade assistant and most of then even get stuck at 99%. So how to fix the issue 'Windows 10 upgrade assistant stuck at 99%' becomes quite important. Here in this article, we'll present you the details about Windows 10 upgrade assistant, reasons that cause Windows 10 upgrade assistant stuck and how to fix Windows 10 upgrade assistant stuck at 99% error.

Windows 10 upgrade assistant stuck

PAGE CONTENT:
Part 1: What is Windows 10 upgrade assistant
Part 2: What causes Windows 10 upgrade assistant stuck
Part 3: How to fix Windows 10 upgrade assistant stuck at 99% error
Method 1: Use partition manager software
Method 2: Use Windows Media Creation Tool
Method 3: Download Windows 10 ISO update
Part 4: Extra tips to fix Windows upgrade assistant stuck error
Notice:
If you have failed to update Windows update assistant or get stuck at 99%, don't be panic. Remember to back up important data and  useful  files before you start finding solutions to fix this upgrade stuck issue. Professional backup software - EaseUS Todo Backup will make it easy and simple for you to backup wanted files and data within 3 steps. You can download it and let it help you backup files now. After backing up data, you can start follow below offered tips and solutions to fix Windows 10 upgrade assistant stuck error with ease now.

Part 1: What is Windows 10 upgrade assistant

According to Microsoft, Windows 10 Update Assistant (also called Upgrade Assistant) is a tool to help keep all Windows systems secure and provide the latest features and improvements. 

It helps Windows users to figure out whether there is a latest update or not and users can use it to download latest Windows 10 update and install in their PC.

Part 2: Reasons that cause Windows 10 upgrade assistant stuck

But some users may encounter such a problem that Windows 10 upgrade assistant fail to update or stuck in 99%. Here are some major reasons that may cause Windows 10 upgrade assistant fail to install or stuck at 99%:

  • Downloaded update files damaged;
  • Unknown system error;
  • Virus or ransomware attack;
  • System or boot partition fail to load new update;
  • ...

So how to fix these problems and get Windows 10 update assistant stuck error fixed? Relax! Here below, we'll provide you some methods for you to fix this error and get Windows 10 updated and installed in your PC without any obstacles.

Part 3: How to fix Windows 10 upgrade assistant stuck at 99% error

Now you may selectively to follow offered methods to fix Windows 10 upgrade assistant stuck error with ease.

Method 1: Use partition manager software

In order to fix unknown system or boot error in Windows 10 that cause upgrade assistant stuck or fail to install error, your best shot is to use a powerful partition manager software to fix system error or extend system and system reserved partition to load new update in PC. 

Here you may try EaseUS Partition Master to fix all these problems with ease. Just free download it and follow next guide to solve all these problems and get Windows 10 update install in your PC now:

Download Now

 Windows 10 is supported

First, check and fix system errors.

 

Step 1: Open EaseUS Partition Master on your computer. Then locate the disk, right-click the partition you want to check, and choose "Check File System".

Check Partition - Step 1

Step 2: In the Check File System window, keep the "Try to fix errors if found" option selected and click "Start".

Check Partition - Step 2

Step 3: The software will begin checking your partition file system on your disk. When it has completed, click "Finish".

Check Partition - Step 3

Second, extend system drive or system reserved partition.

 

Step 1: Launch EaseUS Partition Master

Run partition manager software

Step 2: Free up space to extend partition

If the hard drive has enough unallocated space to extend the target partition, jump to Step 3 and continue.

If not, free up space first:
1. Right-click on a partition next to the target partition and select "Resize/Move".
2. Drag the partition ends to free up space, leaving enough unallocated space behind the target partition, click "OK".

Free up space to extend partition

Step 3: Extend partition

1. Right-click on the target partition and select "Resize/Move".

Resize target partition

2. Drag the target partition handle into the unallocated space to extend partition.

Add space to the target partition

Step 4: Keep all changes

Click the "Execute Operation" button and click "Apply" to keep all changes.

Keep all changes for extending partition

Method 2: Use Windows Media Creation Tool

Windows Media Creation Tool is like an alternative tool for Windows 10 upgrade assistant. With this tool, you can directly run it and run as administrator to upgrade Windows to new Windows 10 from a ISO or USB drive. Here are the detail steps:

Step 1: Select the Download tool, and select "Run". You need to be an administrator to run this tool.

Step 2: On the License terms page, if you accept the license terms, select "Accept".

Step 3: On the What do you want to do? page, select Upgrade this PC now and then select "Next".

Step 4: The tool will start downloading and then installing Windows 10. 

Method 3: Download Windows 10 ISO update

This method is designed to guide users to perform a clean install of Windows 10 and get everything upgraded in PC so to fix Windows 10 upgrade assistant update stuck or fail to install error.

According to follow below steps, you'll get problems solved:

Step 1: Backup important data and files first.

Step 2: Download official Windows 10 ISO files online.

Step 3: Disable anti-virus software.

Step 4: Restart PC and run ISO to start to upgrade and install new Windows 10 in PC.

Step 5: Follow onscreen guidelines and wait to finish the upgrade process.

Then the Windows 10 upgrade assistant will be fixed and not update stuck error will occur again. 

Part 4: Extra tips to fix Windows upgrade assistant stuck error

  • Perform a clean install of Windows 10: this method can help you clean install Windows 10 and your PC will be able to get the new update from Windows 10 upgrade assistant again;
  • Reboot Windows 10 from a bootable disk or restore Windows 10 upgrade assistant by booting PC from bootable disk;

Professional partition manager software - EaseUS Partition Master can help you create a bootable disk and boot PC to a healthy state, then your PC can get new Windows 10 update from upgrade assistant again.

Download Now

 Windows 10 is supported