Visual Studio 2015 FAQ
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I received an error “.NET Framework installation is in progress (0x800713ec)”
This error typically occurs when an installation of the .NET Framework that is separate from Visual Studio is already in progress. Because many components of the Visual Studio installer depend on the .NET Framework, an attempt to install the .NET Framework while Visual Studio is being installed can cause unexpected behavior.
To work around this issue, wait for the .NET Framework installer to finish before you install Visual Studio.