In addition, it doesn’t even work properly for the latest version of OS X.
VirtualBox requires using Terminal commands to get OS X installed. VMware Fusion is not free, but has more features and is generally more powerful and easier to use than VirtualBox. There is a free program called VirtualBox, but it has some drawbacks.
In this article, I’ll walk you through the steps to get OS X installed using VMware Fusion. So if you have a MacBook Pro with OS X El Capitan installed, you can install as many copies of El Capitan into virtual machines on that same machine.