Download Visual Studio 2017 offline installer (No ISO file provide by Microsoft for VS 2017)

Download either one of the following installer:

Visual Studio Community

vs_community.exe

Visual Studio Professional

vs_professional.exe

Visual Studio Enterprise

vs_enterprise.exe

 
Run the following command under administrator right (runas administrator when open cmd)
 
 
Download Visual Studio Community
vs_community.exe --layout c:\vs2017layout --lang en-US

Download Visual Studio Professional
vs_professional.exe --layout c:\vs2017layout --lang en-US

Download in progress:

Source file downloaded to C:\vs2017layout

Reference:

https://docs.microsoft.com/zh-tw/visualstudio/install/install-vs-inconsistent-quality-network