Visual Studio 2019  the feature you are trying to use is on a network resource that is unavailable

https://www.windowscentral.com/how-fix-network-resource-unavailable-install-error-windows-10

注册表打开

计算机\HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\

找到 所有ProductName对应的GUID项目

57987521567CFDB4D8CD2348CBE058F5  Microsoft Visual C++ 2019 X64 Additional Runtime - 14.21.27702

62DBF9290209B993A9A757D1160F9B24  Microsoft Visual C++ 2013 x64 Additional Runtime - 12.0.21005

6E8D947A316B3EB3F8F540C548BE2AB9  Microsoft Visual C++ 2013 x64 Minimum Runtime - 12.0.21005

7C9F8B73BF303523781852719CD9C700  Microsoft Visual C++ 2012 x64 Additional Runtime - 11.0.61030

982E7F918B71CE440A992957706B7F93  Microsoft Visual C++ 2019 X86 Minimum Runtime - 14.21.27702

BD8663123622D2E4BA8B84F75D9331E0  Microsoft Visual C++ 2019 X86 Additional Runtime - 14.21.27702

DC8A59DBF9D1DA5389A1E3975220E6BB  Microsoft Visual C++ 2012 x86 Minimum Runtime - 11.0.61030

FD7CAC7F4253D2C47ABD1E16043A5D6E  Microsoft Visual C++ 2019 X64 Minimum Runtime - 14.21.27702

删除对应的GUID节点 重新安装

Microsoft Visual C++ 2019 X64 Additional Runtime - 14.21.27702

Microsoft Visual C++ 2019 X86 Minimum Runtime - 14.21.27702

Microsoft Visual C++ 2019 X86 Additional Runtime - 14.21.27702

Microsoft Visual C++ 2019 X64 Minimum Runtime - 14.21.27702

我反复尝试 删除了这四个 才安装成功