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This question already has an answer here:

I did not have enough rep to answer or comment on the original question, but I wanted to contribute my findings. See Can't install .net 3.5 on Windows 10 for the original question. I received a warning similar to the one below, although the error code might have been different.

The following feature couldn't be installed:

.NET Framework 3.5 (includes .NET 2.0 and 3.0)

Error code: 0x800F081F

I tried running the update through the "Windows Features" dialog after each change, and reverted a change when it did not work where applicable. I tried different VPN's, changing the settings for "Specify settings for optional component installation and component repair" (source: http://www.askvg.com/fix-cant-install-microsoft-net-framework-3-5-in-windows-8-and-later/), however I did not try offline installation using DISM.exe because I did not have a Win 10 image handy.

marked as duplicate by Ramhound, Pimp Juice IT, magicandre1981 windows-10 Sep 20 '17 at 15:09

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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While in the process of getting the image, I tried the default Microsoft online troubleshooter, and to my surprise installation of .NET 3.5 succeeded after performing the following step:

Fix Windows file corruption:

DISM.exe /Online /Cleanup-image /Restorehealth

sfc /scannow

(see: https://support.microsoft.com/en-us/help/10164/fix-windows-update-errors).

Neither tool indicated that there was anything wrong, so perhaps I made a mistake in isolating my tests.

  • Hi Kevin, no it's not correct, it should have been an answer to the original question, which is protected, so you are not able to answer without some reputation. – bummi Sep 20 '17 at 7:19

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