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Windows Update Catalog

From: https://answers.microsoft.com/en-us/windows/forum/all/2018-11-update-for-windows-10-version-1803-for-x64/865b6641-20aa-447c-a0b0-2d3a6d3f579f

2019-01-17

Open administrative Command Prompt and type following commands one-by-one followed by Enter key. 

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 

From: https://answers.microsoft.com/en-us/windows/forum/all/windows-update-for-windows-7-wont-download/5b231f19-3467-47da-87bf-896fb63bc52c

Also: https://gallery.technet.microsoft.com/scriptcenter/Reset-Windows-Update-Agent-d824badc

Try using this to reset the update system it's very good,
Use Option 2 on the list after right clicking it and select 
run as administrator
https://gallery.technet.microsoft.com/scriptcenter/Reset-Windows-Update-Agent-d824badc
Download it to your downloads folder
Right click it and select Extract all to the downloads folder.
Then right click ResetWUEng and select run as administrator
Follow the rest of the prompts
Press any key to continue
Type 2 for that Option on the list and the Enter key
Press y for Yes I believe twice
After it has completed
Type 15 for that option and the Enter key to restart the machine.

From: https://social.technet.microsoft.com/Forums/en-US/dd93462a-6d63-48e4-9c1b-155da6b7eda0/windows-update-service-keeps-turning-back-on?forum=configmanagerosd

a scheduled task runs every day to run ccmeval.exe. As part of this task Windows Update service will start again if disabled.

From: https://support.microsoft.com/en-us/help/3080351/how-to-manage-windows-10-notification-and-upgrade-options

To block the upgrade by using Computer Configuration, follow these steps:

Click Computer Configuration.
Click Policies.
Click Administrative Templates.
Click Windows Components.
Click Windows Update.
Double-click Turn off the upgrade to the latest version of Windows through Windows Update.
Click Enable.
Policy path: Computer Configuration / Administrative Templates / Windows Components / Windows Update Policy
Setting: Turn off the upgrade to the latest version of Windows through Windows Update

From: http://www.windowscentral.com/errors-windows-10-upgrade-fix

Fixing message 80240020 ….

Also: http://www.digitaltrends.com/computing/common-problems-with-installing-windows-10-and-how-to-fix-them/

Also: http://windows.microsoft.com/en-us/windows-10/upgrade-install-errors-windows-10

Also: https://www.microsoft.com/en-us/software-download/windows10

Manual Download

Also: http://www.infoworld.com/article/2989972/microsoft-windows/windows-10-installation-problems-and-what-to-do-about-them.html

From: https://www.howtogeek.com/247380/how-to-fix-windows-update-when-it-gets-stuck/

Also: https://www.lifewire.com/when-windows-update-gets-stuck-or-frozen-2624439

windows 7 hangs on windows update

From: http://download.wsusoffline.net/

Using "WSUS Offline Update", you can update any computer running Microsoft Windows and 
Office safely, quickly and without an Internet connection.

From: http://www.infoworld.com/article/3105605/microsoft-windows/2-easy-steps-to-speed-up-windows-7-update-scans.html

Also: http://wu.krelay.de/en/

Make sure you have KB 3078601, 3109094, 3138612, 3145739, and 3164033 installed
Find this month’s favored patch and install it