Errors and 0x800F081F 0x800F0906 when installing .Net Framework 3.5 on Windows 8 / 8.1

By default .Net Framework 3.5 in Windows 8 and 8.1 is not installed, so that, firstly, it is not available in 

Visual Studio, and secondly, when you try to run something that uses the .Net 3.5 (for example, Windows 7 SDK), 

you will see about the proposal:

Not a problem, you are probably thinking, and click "Install." In most cases, it is, unfortunately, no good and 

will not cause you get an error

In the English version of Windows error is:0x800F0906 The source files could not be downloaded.

Windows could not connect to the Internet to download necessary files. Make sure that you're connected to 

the Internet and click "Retry" to try again.

The most interesting thing in this case with the Internet all right. The next attempt will probably be installing .Net 

3.5 via the control panel or download the installation package NetFx35.exe and attempt to install it. Most likely, 

these attempts will end about the same - an error 0x800F081F The source files could not be found.

But, nevertheless, it is possible to install .Net Framework 3.5. To do this, insert the installation DVD, open a 

command console (CMD.EXE) as an administrator and run the following command:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source: {Disk Drive DVD}: \sources\sxs

replacing {DVD} to the drive with the letter of your DVD drive. Most likely as a result of this command,
everything will be fine and .Net 3.5 is still established.

However, in some cases, if you have Windows 8.1, this is still not enough and you'll get an error 0x800F081F.

This can happen in that case, if you set one or more of these updates (most likely, all three and installed): 

KB2966826, KB2966827 and KB2966828. All three updates - security updates for .Net Framework 3.5 in 

Windows 8.1. Windows Update from somehow sets even though, .Net 3.5 is installed or not. So, to solve the 

problem you need to remove these three updates. After removing all these updates be installed without 

problems.

Yes, the update then you can install again. 

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