Failed to start host 'desktopClr.x86$IdentityHost

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用户在回滚Win10版本后遇到VS2019插件错误，通过升级到16.4版本并进一步尝试16.5 Preview 1解决。该文记录了详细的解决方案及安装过程。

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Failed to start host 'desktopClr.x86$IdentityHost

20191211 zhangbin

回滚了win10版本，vs2019插件报错，回滚前有升级到16.4
升级vs2019 到16.4，修复，相当于重装
重启后，报错

很多类似的，无解

https://stackoverflow.com/questions/59202899/unable-to-start-visual-studios-2019-16-4
里面说16.5 preview1 ok
找了好久，vs installer 有个专门的preview 安装程序
preview
装好后果然ok，vs2019 和vs2019 preview 是俩不同的
卸载vs2019

vs2019 16.5 preview1

-- Selecting Windows SDK version 10.0.17763.0 to target Windows 10.0.18362.
-- The C compiler identification is MSVC 19.0.24234.1
-- The CXX compiler identification is MSVC 19.0.24234.1
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64_x86/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64_x86/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64_x86/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64_x86/cl.exe -- works
-- Detecting CXX compiler ABI info