全新安装El Capitan（10.11），尝试安装Android Studio版本1.21。

错误：

Android Studio was unable to find a valid JVM. Please download it from:

也不会安装可从Apple -Java for OS X 2014-001下载的文件。

错误：

Java for OS X can't be installed on this disk. A newer version of this package is already installed

使它运行的最佳方法是什么？