** for Windows: https://git-for-windows.github.io/
** for Linux: please refer to your distribution package manager
* install/configure ssh(please refer to https://git-scm.com/book/it/v2/Git-on-the-Server-Generating-Your-SSH-Public-Key)
* download VirtualBox from http://www.virtualbox.org and install it
** tested with 5.0.14 (does NOT work with 5.0.0)