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最近私は、ビジュアルスタジオ2017オフラインインストーラをダウンロードしました。私がインストーラからVisual Studioをインストールしようとしたとき、私はインターネット接続があるときに動作することを認識しました。最初に私はそれが接続すると思って何もダウンロードしません。しかし、私は再びインターネットを無効にしたとき、私は次のログを得ました：なぜvisual studio 2017オフラインインストーラはインターネットを使用していますか？
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
ビジュアルスタジオのインストーラは、ダウンロードしたファイルを使用していないようです。これは、ダウンロードされたファイルの一部です： 
事前に感謝！