安装QC出现错误 : This file has no digital signature or the publisher is untrusted

方法１：
Suggest you add your ALM Server to Trusted Sites

方法２：
If that doesn't work then try the following URL : http://<ALM Server>/qcbin/start_a.jsp?cancelcrlcheck=true
Where ALM Server is your server.

方法３：
把ＩＥ的Advanced-->Security设置改为：取消
check for publisher's certificate revocation


方法３解决了我的问题。