error code 0X8007042b

Question

I have windows 10 pro version 1709 and windows keeps trying to upgrade to version 1803 but gets error code 0X800742b with no other info and fails the upgrade.  Can someone help?

Answer 1

Hi Jim, Microsoft have released version 1809 of Windows 10, click the link below, then click 'Update Now' on that page to immediately get 1809 and bring your PC right up to date

https://www.microsoft.com/en-us/software-downlo...

Answer 2

Hi,

My name is Angel. I am an Independent Advisor. Thank you for posting in Microsoft Community.

I would suggest you to follow these methods:

Method 1.

Run the Windows Update troubleshooter

1.Download the Windows Update Troubleshooter, and then select Open or Save in the pop-up window:

https://aka.ms/wudiag

Notes

• If the pop-up doesn’t come up, you might have a pop-up blocker on. If you’re using Microsoft Edge, instructions for disabling the pop-up blocker are here. For Internet Explorer, instructions are here. If you are using a different browser or separate pop-up blocker, check the website of the browser or blocker’s manufacturer.

• If you select Save, you need to go to the folder where the troubleshooter is downloaded to after the download is complete, and then double-click the latest wu.diagcab file to run the troubleshooter.

2.Select Next and follow the steps in the wizard to find and fix problems with Windows Update .

Method 2.

Download the most recent Servicing Stack Update (SSU)

Determine whether you are using 32-bit or 64-bit Windows:

1. From Start, choose Settings.

2. Select System.

3. Click About.

4. Scroll down to System type.

Download the version of the latest SSU (KB4456655) that matches your version of Windows from the Microsoft Update Catalog.

Restart your device and check for updates.

Did this resolve the issue?

Method 3.

Download the most recent KB

1. Go to the Update history page. [https://support.microsoft.com/help/12387/window...](https://support.microsoft.com/help/12387/windows-10-update-history?ocid=update_setting_client)

2. Find the most recent update KB for the version of Windows 10 you have – it’s usually at the top of the list – and either write the KB number down or copy it.

3. Go to the Microsoft Update site and search for the KB number. [http://catalog.update.microsoft.com/v7/site/Hom...](http://catalog.update.microsoft.com/v7/site/Home.aspx)

4. Select the link for the download, and then choose Download. Select Save if you are prompted. 

5. When the download completes, select Open to start the update.

Method 4.

Fix Windows file corruption

Important

You need to run both the DISM and SFC commands shown below, not just one of them.

1. Open an elevated command prompt. To do this, right click the Windows button, and then select Command Prompt (Admin). If you are prompted for an administrator password or for a confirmation, type the password, or click Allow or Yes.

2. Type the following command, and then press Enter.

DISM.exe /Online /Cleanup-image /Restorehealth

Note It might take several minutes for the command operation to be completed.

3. Type the following command and press Enter.

sfc /scannow

Note It might take several minutes for the command operation to be completed.

4. Close the command prompt, and then run Windows Update again.

Method 5.

Perform an in-place upgrade

Download the Windows 10 Media Creation Tool (MCT) https://www.microsoft.com/software-download/win... and use it to perform an “in-place upgrade” of Windows 10. We have a video that can show you how if you aren’t sure. https://aka.ms/W10CleanInstall

Source:

https://support.microsoft.com/en-us/help/10164/...

Hope the information provided is useful. If the issue persists, reply here and we will be glad to help you.

Angel.

Answer 3

You should upgrade to 1809 by manual method. Execute below steps -

1. Right click on Windows Start > Windows Powershell (Admin)

Type following (or copy and paste following) one by one and Enter

net stop wuauserv

net stop cryptSvc

net stop bits

net stop msiserver

Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

Ren C:\Windows\System32\catroot2 Catroot2.old

net start wuauserv

net start cryptSvc

net start bits

net start msiserver

2. Type following in Windows Start Search box and hit Enter %systemroot%\Logs\CBS > Rename CBS.Log to something else.

If it doesn't allow you to rename - Type services in Windows Start Search box > Click Services > Scroll down to find the Windows Modules Installer service and double-click on it > Set its startup type to Manual > Reboot your computer

Go to C:\Windows\Logs\CBS > Rename CBS.Log > Reboot your computer > Then go back into the Services App and set Windows Modules Installer Service back to Automatic Startup (Note CBS log files contain information about windows update, SFC etc)

(Source - https://partnersupport.microsoft.com/en-us/par_...)

3. Uninstall any third party Antivirus (After update is successful, you can install it again)
4. You can go to https://www.microsoft.com/en-us/software-downlo...

You can download the latest Windows 10 package from this link (media creation tool) and follow the instructions there to upgrade. Use the very simple instructions given under Using this tool to upgrade this PC to Windows 10

Answer 4

Hi,

Try updating to Windows 10 October update version 1809, manually.

The fastest way to get the upgrade is through Media creation tool or ISO file.

Please download Media Creation Tool from the link below and select Upgrade this PC at the first screen.

https://go.microsoft.com/fwlink/?LinkId=691209

All steps, including upgrading using ISO file and Media creation tool, are covered here:

https://www.yourwindowsguide.com/2018/10/update...

Disclaimer:

This is a non-Microsoft website which would provide accurate and safe information. Watch out for ads on the site which are frequently classified as a PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers as they do more harm than good sometimes.

Answer 5

Hello,

Suggest you to directly upgrade to Windows 10 V1809 via ISO file:

https://www.kapilarya.com/how-to-upgrade-to-win...

Let us know if this helps!

Note: Included link(s) in this reply refers to blog post by a trusted Microsoft MVP.