Installation failed: service FortiShield failed to start
看提示，我以为是权限方面的问题。用管理员运行依然出错。
上网查了下，好像是关于签名的问题，需要安装更新
FortiClient 5.4 drivers are digitally signed with a SHA-2 certificate. You may want to check if you have the following update installed on your system:
Availability of SHA-2 Code Signing Support for Windows 7 and Windows Server 2008 R2
更新地址：
https://docs.microsoft.com/zh-cn/security-updates/SecurityAdvisories/2015/3033929
win7:https://www.microsoft.com/en-us/download/details.aspx?id=46148
https://www.microsoft.com/zh-cn/download/details.aspx?id=46009
