最近安装VS2019和UE4的时候总是弹出提示框（忘记截图了，找了张类似的…）
点击OK之后会弹出下面的对话框
度娘给出茫茫多的解决方案，大部分都是说缺少vc++2015或者vc++2017的相应库，需要先安装低版本库，试了大半天都不能解决（吐血！！）。
最后翻墙Google之后，给出一种相反的方案，vc++2015或者vc++2017库过时了，需要先卸载掉。尝试一番，果然可以，再次吐槽度娘的无力！
原文：This isn’t a problem with the Visual C++ 2015 - 2019 redistributable that you are trying to install. There is a Visual C++ 2015 redistributable already installed and the problem is with that.
The version of the redistributable that you are trying to install is trying to remove the old version of the Visual C++ redistributable, and this is failing.
To remove this redistributable, you must obtain a copy of the Visual C++ 2015 version 14.0.24215 and use that to remove the redistributable. It must be this exact version. Once you have done that then the Visual C++ 2015 - 2019 will install.
最后如果vc++库不能正常卸载或者找不到卸载程序，可以使用微软提供的Windows Installer Clean UP专业卸载软件卸载，比某些号称专业的卫士好百倍。
好用的东西微软已经不再提供支持了，找不到官方的，可以度娘一下。
