Most of us use Windows Update or Microsoft Update to keep our Windows operating system and Microsoft software updated. But if you want to, for some, reason, download the updates manually and save it to your computer, this is how you can go about it:
Download Windows Update manually
Open your
Control Panel and navigate to the
Windows Update applet. If updates are available, click on the Important updates are available, or the Optional updates are available link. You will be able to see the list along with the KB numbers.

If no updates are available, click on
Review your update history link. Here you will see the complete list of Windows Updates including Security Updates and Service Packs, if any, which have been installed on your computer.

Note the KB number mentioned in the bracket and search for it here on Microsoft.com. If you find no suitable results for Downloads, select
All Microsoft. In the results, you will see the Knowledge Base article about the update or hotfix and also the Download page.

If you open its KB article page, you will see the download links for all operating system.
Select your operating system and click on the link to be taken to its download page.
Click on the
download button to download and save the Windows Update to your computer.

This way, you will be able to install the update manually on any one or more of your computers, as long as it applies to the installed operating system or software.
Downloading, saving and installing Windows Update manually may be done if you need to save the updates for some reason or if you find that you are unable to update you Windows using Windows Update.