在线等！求教 iOS 企业证书通过网站分发APP，提示“无法下载 APP”的问题

我今天遇到了这样的问题。我按这个http://wex5.com/cn/bbs/forum.php?mod=viewthread&tid=69401&extra=page%3D1 介绍的在GitHub上传了plist文件。
我的连接是这样的itms-services:///?action=download-manifest&url=https://raw.githubusercontent.com/****/master/manifest.plist，这个连接在手机的Safari里面是无法打开的。
但，可以在我写的一个demo里面点击“下载”（链接是这个网址）会提示“是否下载”，可是下载不成功，提示 “无法下载APP （目前无法下载“app名字”）”这是为什么呢？
可以正常弹出“raw.githubusercontent.com”想要安装“app”,取消或者安装。点击安装后无法下载
 ipa 的路径是在HTTPS上的，公司的人搭的，plist文件我放在了github上。两张图片也跟IPA包放在了一起。
这是我的plist文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>items</key>
        <array>
                <dict>
                        <key>assets</key>
                        <array>
                                <dict>
                                        <key>kind</key>
                                        <string>software-package</string>
                                        <key>url</key>
                                        <string>https://**.**.**.***/ios/name/name.ipa</string>
                                </dict>
                                <dict>
                                        <key>kind</key>
                                        <string>display-image</string>
                                        <key>url</key>
                                        <string>https://**.**.**.***/ios/iamge1.jpg</string>
                                </dict>
                                <dict>
                                        <key>kind</key>
                                        <string>full-size-image</string>
                                        <key>url</key>
                                        <string>https://**.**.**.***/ios/image2.jpg</string>
                                </dict>
                        </array>
                        <key>metadata</key>
                        <dict>
                                <key>bundle-identifier</key>
                                <string>com.*****.name</string>
                                <key>bundle-version</key>
                                <string>1.1</string>
                                <key>kind</key>
                                <string>software</string>
                                <key>title</key>
                                <string>name</string>
                        </dict>
                </dict>
        </array>
</dict>
</plist>