Win8系统安装msi文件时遇到问题，弹出对话框：
The installer has encountered an unexpected error installing this package.this may indicate a problem with package.the error code is 2502.
The installer has encountered an unexpected error installing this package.this may indicate a problem with package.the error code is 2503.
这是Win8系统的权限问题，可以如下解决:
1.运行CMD（管理员）
2.输入以下命令： msiexec /package "你安装程序包的路径"