我也是这样的,已经解决
打开运行,输入cmd 进入
cd "d:\Program Files\Fiddler" -----你fiddler安装的路径
然后输入下面这段代码,输入完敲回车,再去下载证书,就OK了,我已经解决,我是雷锋,不谢,交流扣扣3011808741
makecert.exe -r -ss my -n "CN=DO_NOT_TRUST_FiddlerRoot, O=DO_NOT_TRUST, OU=Created by
http://www.fiddler2.com" -sky signature -eku 1.3.6.1.5.5.7.3.1 -h 1 -cy authority -a sha1 -m 120 -b 09/05/2012