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Unable to install.net 3.5, error code 0x800F081F

Anonymous
2025-05-04T19:18:51+00:00

Follow the online tutorial to set Windows update to open automatically, still useless. After that I tried the dism still appear error code 0x800F081F.

Windows for home | Windows 11 | Install and upgrade

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  1. Anonymous
    2025-05-07T16:44:09+00:00

    win11 iso

    CBS&DISM.log https://gofile.io/d/WdgZzG

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  2. Ramesh Srinivasan 173.9K Reputation points Volunteer Moderator
    2025-05-07T17:10:56+00:00

    Please try downloading these three .NET Framework 3.5 CAB files from uupdump. https://uupdump.net/findfiles.php?id=7c770de4-fea9-47d7-a9eb-40cec792977a

    • Microsoft-Windows-NetFx3-OnDemand-Package.cab
    • Microsoft-Windows-NetFx3-OnDemand-Package-amd64.cab
    • Microsoft-Windows-NetFx3-OnDemand-Package-amd64_1ce7a653.cab

    Move then to a folder, say C:\sxs.

    Run DISM mentioning c:\sxs as the source.

    dism /online /enable-feature /featurename:NetFX3 /All /Source:C:\sxs /LimitAccess

    If nothing helps, please repair install Windows 11 via Settings.

    Launch Settings > System > Recovery. Under "Fix problems using Windows Update", select "Reinstall now."

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  3. Anonymous
    2025-05-07T17:26:55+00:00

    What is the difference between these cab files and under Windows11 ISO directory \sources\sxs?

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  5. Ramesh Srinivasan 173.9K Reputation points Volunteer Moderator
    2025-05-07T17:41:04+00:00

    I found this in one of the logs.

    2025-05-05 03:26:30, Info                  CBS    FOD: Mismatched package: \\?\I:\sources\sxs\Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~~.cab, FOD identity:, cab identity:Microsoft-Windows-NetFx3-OnDemand-Package~31bf3856ad364e35~amd64~~10.0.19041.1

    19041 is Windows 10.

    So, you may try the Uup cab file. Or run the repair installation, which should fix the CBS issues.

    If you have the Windows 10 ISO, you could also try that to see what happens.

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