Hi Alice,
I realize that you are unable to download the KB3176495 update in Windows 10, let me assist you.
This issue might occur if the Windows update components are corrupted or if some software or service is causing the issue.
I suggest you to perform the below troubleshooting methods and check if it helps.
Method 1: Run the Windows Update troubleshooter.
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Type Troubleshooting in the search and select
Troubleshooting.
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Click on View all option in the left pane.
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Find and click on the Windows update troubleshooter.
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Follow the on-screen instructions.
If the issue still persists, try method 2.
Method 2: Perform a Clean boot to disable startup programs and services.
Clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program or an update or when you run a program
Refer to the article below on How to perform a clean boot in Windows
and check if it helps.
https://support.microsoft.com/en-us/kb/929135
Note: Once you are done with clean boot, refer to the section:
How to reset the computer to start normally after clean boot troubleshooting
in the article to put your computer back to normal startup.
Hope the information helps. Kindly write back to us with the updated status of the issue for further assistance on Windows. We will be glad to assist you.