why visual studio 2017 offline installer uses internet?

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Recently I have downloaded a visual studio 2017 offline installer. when I tried to install visual studio from the installer I recognized that it just work when there is an internet connection. First I thought it just connects and won't download anything. but when I disabled the internet again I got the following log:

The product failed to install the listed workloads and components due to one or more package failures.

Incomplete workloads
    .NET desktop development (Microsoft.VisualStudio.Workload.ManagedDesktop,version=15.0.26323.1)
    Desktop development with C++ (Microsoft.VisualStudio.Workload.NativeDesktop,version=15.0.26403.0)
    Visual Studio core editor (Microsoft.VisualStudio.Workload.CoreEditor,version=15.0.26228.0)

Incomplete components
    .NET desktop development tools (Microsoft.VisualStudio.Component.ManagedDesktop.Prerequisites,version=15.0.26323.1)
    .NET Framework 4.6.1 development tools (Microsoft.Net.ComponentGroup.DevelopmentPrerequisites,version=15.0.26208.0)
    .NET Portable Library targeting pack (Microsoft.VisualStudio.Component.PortableLibrary,version=15.0.26208.0)
    Architecture tools for C++ (Microsoft.VisualStudio.ComponentGroup.ArchitectureTools.Native,version=15.0.26208.0)
    Blend for Visual Studio (Microsoft.ComponentGroup.Blend,version=15.0.26208.0)
    C# and Visual Basic (Microsoft.VisualStudio.Component.Roslyn.LanguageServices,version=15.0.26208.0)
    C++ profiling tools (Microsoft.VisualStudio.Component.VC.DiagnosticTools,version=15.0.26208.0)
    Class Designer (Microsoft.VisualStudio.Component.ClassDesigner,version=15.0.26208.0)
    ClickOnce Publishing (Microsoft.Component.ClickOnce,version=15.0.26208.0)
    Code Map (Microsoft.VisualStudio.Component.CodeMap,version=15.0.26208.0)
    Data sources and service references (Microsoft.VisualStudio.Component.VisualStudioData,version=15.0.26208.0)
    DGML editor (Microsoft.VisualStudio.Component.GraphDocument,version=15.0.26208.0)
    Entity Framework 6 tools (Microsoft.VisualStudio.Component.EntityFramework,version=15.0.26208.0)
    Graphics debugger and GPU profiler for DirectX (Microsoft.VisualStudio.Component.Graphics.Tools,version=15.0.26208.0)
    IntelliTrace (Microsoft.VisualStudio.Component.IntelliTrace.FrontEnd,version=15.0.26208.0)
    Just-In-Time debugger (Microsoft.VisualStudio.Component.Debugger.JustInTime,version=15.0.26208.0)
    Live Unit Testing (Microsoft.VisualStudio.Component.LiveUnitTesting,version=15.0.26208.0)
    Managed Desktop Workload Core (Microsoft.VisualStudio.Component.ManagedDesktop.Core,version=15.0.26208.0)
    Profiling tools (Microsoft.VisualStudio.Component.DiagnosticTools,version=15.0.26208.0)
    Text Template Transformation (Microsoft.VisualStudio.Component.TextTemplating,version=15.0.26208.0)
    Visual C++ core desktop features (Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Core,version=15.0.26323.1)
    Visual C++ tools for CMake (Microsoft.VisualStudio.Component.VC.CMake.Project,version=15.0.26208.0)
    Visual Studio C++ core features (Microsoft.VisualStudio.Component.VC.CoreIde,version=15.0.26208.0)
    Visual Studio core editor (Microsoft.VisualStudio.Component.CoreEditor,version=15.0.26208.0)

You can search for solutions using the information below, modify your selections for the above workloads and components and retry the installation, or remove the product from your machine.

Following is a collection of individual package failures that led to the incomplete workloads and components above. To search for existing reports of these specific problems, please copy and paste the URL from each package failure into a web browser. If the issue has already been reported, you can find solutions or workarounds there. If the issue has not been reported, you can create a new issue where other people will be able to find solutions or workarounds.

Package 'Microsoft.VisualStudio.Branding.Enterprise,version=15.0.26403.0,language=en-US' failed to download from 'https://download.microsoft.com/download/8/E/C/8EC90B51-D2C1-4AD2-9F6B-FCEA606170A1/microsoft.visualstudio.branding.enterprise.vsix'.
    Search URL: https://aka.ms/VSSetupErrorReports?q=PackageId=Microsoft.VisualStudio.Branding.Enterprise;PackageAction=DownloadPackage;ReturnCode=0x80072ee7
    Details
        WebClient download failed: The remote name could not be resolved: 'download.microsoft.com'
        Bits download failed: File not found.
        WinInet download failed: Function: InternetOpenUrl, HR: -2147012889, Message: Unknown error 12007

Package 'Microsoft.VisualStudio.MinShell.Resources,version=15.0.26403.0,language=en-US' failed to download from 'https://download.microsoft.com/download/4/8/6/48682365-1268-4CFF-B26A-40DA96DCF3C9/microsoft.visualstudio.minshell.resources.vsix'.
    Search URL: https://aka.ms/VSSetupErrorReports?q=PackageId=Microsoft.VisualStudio.MinShell.Resources;PackageAction=DownloadPackage;ReturnCode=0x80072ee7
    Impacted workloads
        .NET desktop development (Microsoft.VisualStudio.Workload.ManagedDesktop,version=15.0.26323.1)
        Desktop development with C++ (Microsoft.VisualStudio.Workload.NativeDesktop,version=15.0.26403.0)
        Visual Studio core editor (Microsoft.VisualStudio.Workload.CoreEditor,version=15.0.26228.0)
    Impacted components
        .NET desktop development tools (Microsoft.VisualStudio.Component.ManagedDesktop.Prerequisites,version=15.0.26323.1)
        .NET Framework 4.6.1 development tools (Microsoft.Net.ComponentGroup.DevelopmentPrerequisites,version=15.0.26208.0)
        .NET Portable Library targeting pack (Microsoft.VisualStudio.Component.PortableLibrary,version=15.0.26208.0)
        Architecture tools for C++ (Microsoft.VisualStudio.ComponentGroup.ArchitectureTools.Native,version=15.0.26208.0)
        Blend for Visual Studio (Microsoft.ComponentGroup.Blend,version=15.0.26208.0)
        C# and Visual Basic (Microsoft.VisualStudio.Component.Roslyn.LanguageServices,version=15.0.26208.0)
        C++ profiling tools (Microsoft.VisualStudio.Component.VC.DiagnosticTools,version=15.0.26208.0)
        Class Designer (Microsoft.VisualStudio.Component.ClassDesigner,version=15.0.26208.0)
        ClickOnce Publishing (Microsoft.Component.ClickOnce,version=15.0.26208.0)
        Code Map (Microsoft.VisualStudio.Component.CodeMap,version=15.0.26208.0)
        Data sources and service references (Microsoft.VisualStudio.Component.VisualStudioData,version=15.0.26208.0)
        DGML editor (Microsoft.VisualStudio.Component.GraphDocument,version=15.0.26208.0)
        Entity Framework 6 tools (Microsoft.VisualStudio.Component.EntityFramework,version=15.0.26208.0)
        Graphics debugger and GPU profiler for DirectX (Microsoft.VisualStudio.Component.Graphics.Tools,version=15.0.26208.0)
        IntelliTrace (Microsoft.VisualStudio.Component.IntelliTrace.FrontEnd,version=15.0.26208.0)
        Just-In-Time debugger (Microsoft.VisualStudio.Component.Debugger.JustInTime,version=15.0.26208.0)
        Live Unit Testing (Microsoft.VisualStudio.Component.LiveUnitTesting,version=15.0.26208.0)
        Managed Desktop Workload Core (Microsoft.VisualStudio.Component.ManagedDesktop.Core,version=15.0.26208.0)
        Profiling tools (Microsoft.VisualStudio.Component.DiagnosticTools,version=15.0.26208.0)
        Text Template Transformation (Microsoft.VisualStudio.Component.TextTemplating,version=15.0.26208.0)
        Visual C++ core desktop features (Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Core,version=15.0.26323.1)
        Visual C++ tools for CMake (Microsoft.VisualStudio.Component.VC.CMake.Project,version=15.0.26208.0)
        Visual Studio C++ core features (Microsoft.VisualStudio.Component.VC.CoreIde,version=15.0.26208.0)
        Visual Studio core editor (Microsoft.VisualStudio.Component.CoreEditor,version=15.0.26208.0)
    Details
        WebClient download failed: The remote name could not be resolved: 'download.microsoft.com'
        Bits download failed: File not found.
        WinInet download failed: Function: InternetOpenUrl, HR: -2147012889, Message: Unknown error 12007

It seems visual studio installer doesn't use downloaded files. This is part of the files that have been downloaded: pic

visual-studio
visual-studio-2017
asked on Stack Overflow Jun 5, 2017 by Koorosh • edited Sep 14, 2018 by Stephen Kennedy

2 Answers

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If Your installer not use downloaded files, this may be due to the following reasons:

  1. incomplete download - wrong size or crc (View file Catalog.json at installation root.);

  2. there is newer version of file (version,crc & size look at Catalog.json).

answered on Stack Overflow Feb 17, 2018 by Mark Martin
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"Recently I have downloaded a visual studio 2017 offline installer."

Visual Studio 2017 has got a setup file - a bootstrap; it hasn't got an offline installer to download, for legal reasons. Microsoft can't package up the Android Installer from Google, for example, into an ISO. The user needs to download certain things themselves dynamically.

On need, there's a way to CREATE an offline installer. There's docs that walk you through it. Updated these days (28/Aug/2018), Visual Studio Docs has a set of instructions How to Create an offline installation of Visual Studio 2017.

Another link that provides assistance through the process .

answered on Stack Overflow Sep 14, 2018 by Amit G. • edited Sep 15, 2018 by Amit G.

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