Cannot install KB5066791 or KB5042320

Margot Hummer 80 Reputation points
2026-06-19T13:48:59.81+00:00

On windows update it tells me You're not up to date. In red letters, "Your device is missing important security and quality fixes." I have reloaded Windows 10 and the problem still exists.

I have windows 10 Home

10.0.19045 Build 19045

I have ESU and I've tried several things recommended and nothing has worked. How do I get things up to date and get rid if this red error message?

Windows for home | Windows 10 | Windows update
Answer accepted by question author
Ramesh 181.9K Reputation points Volunteer Moderator
2026-06-19T17:35:49.3233333+00:00

Please try this link. It works fine here.

https://learn.microsoft.com/en-us/answers/a/12426465

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Answer accepted by question author
Ramesh 181.9K Reputation points Volunteer Moderator
2026-06-19T17:30:57.9533333+00:00

The only fix you need is here. Please see accepted answer in the thread below:

device missing important security and quality issues - Microsoft Q&A

That should resolve the "Your device is missing important security and quality fixes" misleading error.

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Answer accepted by question author
Ramesh 181.9K Reputation points Volunteer Moderator
2026-06-19T16:41:39.2366667+00:00

The only fix you need is here. Please see accepted answer in the thread below:

device missing important security and quality issues - Microsoft Q&A

That should resolve the "Your device is missing important security and quality fixes" misleading error.

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1 person found this answer helpful.

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  1. Ramesh 181.9K Reputation points Volunteer Moderator
    2026-06-19T17:10:19.2566667+00:00

    Hi Margot,

    Your system is already up-to-date.

    Have you checked my earlier post? See link below.

    https://learn.microsoft.com/en-us/answers/a/12836127

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  2. Margot Hummer 80 Reputation points
    2026-06-19T16:33:56.1633333+00:00

    I used windows 10 installation media.

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