.net-3.5windows 10
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.
That message is trying to tell you that you need to install .NET 3.5 a different way under Windows 7. Because it's included as part of the operating system, you use the "Turn Windows features on or off" function to get to it, instead of installing a downloaded redistributable package.
Remove the Updates KB2966826 and KB2966828, reboot and try to activate .Net 3.5 again. Both are .Net 3.5 updates and they block the setup. Microsoft is aware of the issue and tries to fix it.
If you have any addition MUI packs installed you need the DVD of the additional language, copy the SxS folder of both DVDs to a local folder C:\sxs and point with the /source parameter of DISM to this folder:
DISM.exe /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:C:\sxs /Limitaccess
I wrote this last year to Microsoft but they still haven't updated the documentation.
Best Answer
Please open a command prompt (cmd.exe) as admin and run the following command to install .Net 3.5:
(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 DemandISO, mount the ISO, copy the Microsoft-Windows-NetFx3-OnDemand-Package.cab to C:\Features (or a different folder) and those commands:If this fails, run this: