mysql无法安装，报 The older version of MySQL Installer - Community cannot be removed. Contact your technical support group

解决办法：

C:\Users\Administrator>msiexec /i C:\Users\Administrator\Downloads\mysql-install
er-web-community-5.7.23.0.msi /l*v C:\msi.log

 

打开msi.log, 找到类似

HKLM\Software\Classes\Installer\Products\B1516CACECCBBB94B9FE5E819EB306AD\SourceList 中出现意外值或缺少值: (名称: PackageName，值: )

的注册表项

删除B1516CACECCBBB94B9FE5E819EB306AD