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我有一个运行着mac os 10.10的设备，我想在那上面安装qt 5.9。但是在download.qt.io上，它提示Download from your IP address is not allowed。 我又试了下online installer，结果online installer打不开，估计是不支持旧版的操作系统。 我在网上找镜像，也没有找到能用的镜像。 我到底要用什么方法才能获取qt 5.9 for mac呢？
