iOS ipa 下载链接问题。

Question

1. 七牛平台服务器存放我的iOS ipa下载链接， 同一下载链接，
   下载链接地址：https://dn-gzxd.qbox.me/xietongbangong.html

      IOS 9以上系统 能够点击图标 并安装成功。
      ios 8系统 点击图标，提示无法连接到地址，不能安装。

   问题截图：

Answer 1

If anyone knows why, please reply.

Answer 2

My iOS9 also shows that it cannot be connected

Answer 3

Did your project settings only support versions above ios9? Normal is 7.0

Answer 4

Is your plist file written incorrectly