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When I try to install .net 3.5 I get the follwing message:

The following feature couldn't be installed:

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

Error code: 0x800F081F

I tried with a standalone package and through Windows Features.

Update: Internet connection is fine.

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4 Answers 4

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Please open a command prompt (cmd.exe) as admin and run the following command to install .Net 3.5:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /Source:d:\sources\sxs /All /LimitAccess 

(replace D: with your mounted Win10 ISO)

In some environment, DISM fails to fetch the file (Proxy, network policies). The DISM command takes the files from the DVD and you're fine.

If you are MSDN subscriber you can also download the Windows 10 Features on Demand ISO, mount the ISO, copy the Microsoft-Windows-NetFx3-OnDemand-Package.cab to C:\Features (or a different folder) and those commands:

DISM.EXE /Online /Add-Capability /CapabilityName:NetFx3~~~~ /Source:C:\Features

If this fails, run this:

DISM.EXE /Online /Add-Package /PackagePath:C:\Features\Microsoft-Windows-NetFx3-OnDemand-Package.cab
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  • Perfect, worked immediately.
    – brettdj
    Jan 25, 2016 at 3:21
  • 12
    I was stumped when this was failing as well but then found out I had a group policy blocking me from enabling windows features. gpedit.msc >> Computer Configuration >> Administrative Templates >> System >> Specify settings for optional component installation and component repair. Set to Enabled and check Contact Windows Update directly to download repair content instead of Windows Server Update Services (WSUS) - source: askvg.com/… Feb 9, 2016 at 18:19
  • 1
    What if I have no windows 10 DVD with me. Can we download it from some location and point it to that location?
    – Kurkula
    May 27, 2016 at 22:32
  • @Chandana you can download the ISO from Microsoft: microsoft.com/en-us/software-download/techbench May 28, 2016 at 7:22
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    For me, only the last command DISM.EXE /Online /Add-Package /PackagePath:C:\Features\Microsoft-Windows-NetFx3-OnDemand-Package.cab worked. It is crucial that the cabinet file resides at a location considered "safe" by Windows. Installing from a USB thumb drive might lead to error 800F0950. I ended up copying the file to C: as shown in the example provided.
    – Hermann
    Jan 15, 2018 at 14:40
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Windows Side by Side (WinSxS) location is probably empty in the registry.

From the GUI called from APPWIZ.CPL this results in error code: 0x800F081F

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Servicing]
"LocalSourcePath"="d:\\sources\\sxs"

Check/add the subkey 'Servicing', and the value of 'LocalSourcePath'. It should contain a correct string (e.g. 'd:\sources\sxs'), data type (REG_SZ). Where "d:" represents your Windows media drive letter.

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  • All other suggestions here never worked, but this has on 4 PCs for me now. Thanks very much! Mar 13, 2018 at 14:30
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I was stumped when this was failing as well but then found out I had a group policy blocking me from enabling windows features. gpedit.msc >> Computer Configuration >> Administrative Templates >> System >> Specify settings for optional component installation and component repair. Set to Enabled and check Contact Windows Update directly to download repair content instead of Windows Server Update Services (WSUS) - source:https://www.askvg.com/fix-cant-install-microsoft-net-framework-3-5-in-windows-8-and-later/

From strikeforcezero comment

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This may be another option:

https://sourceforge.net/projects/framework-3-offline/

Uploaded on 2016-06-27 - last comments were in 2019. Appears to work with an air-gapped computer.

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