This release corresponds to the VirtualBox appliance distributed at CVPR 2015 during the Open Source Structure from Motion tutorial on June 7th in Boston, MA. You can reconstruct this virtual machine from source using Vagrant.
You can also download the built VirtualBox appliance and other course material here:
http://midas3.kitware.com/midas/community/46
Direct link: open-source-sfm.ova (Note: this is a 2.7GB download)