Windows Defender Antivirus is a Windows built-in antimalware product.
It is pre-installed on your Windows computer.
So, youd better turn on Windows Defender Antivirus and ensure you are using the latest version.
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How to update Windows Defender?
Usually, Windows can automatically upgrade it when a new version is released.
However, there are also some other Windows Defender update methods.MiniTool Softwarewill show them in this post.

How to Upgrade Windows Defender Antivirus?
Automatic update Windows Defender
Usually, Windows Defender can automatically get its updates along with Windows updates.
Keep on reading to get these two methods.
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Windows Update not working issue has different situations.
Now, we summarize several effective solutions which can help you solve it easily.
you gotta pick the correct source to download based on the Windows operating system you are using.

Here are the Windows Defender download links for different OSs: Windows Defender Windows 10 download64 bit|32 bit|ARM.
It may even make you lose your data.
it’s possible for you to try MiniTool Power Data Recovery.
Bottom Line
Now, you should know how to perform a Windows Defender update in different situations.
You also get a useful data recovery program to recover your lost and deleted data.
Should you have any related issues, it’s possible for you to let us know in the comment.