Click on the link under "Program" on the menu to the left to download the latest version of Ncorr. The download is a .zip file containing .m, .cpp, and .h source files as well as the BSD license. Ncorr requires MATLAB 2009a+ and contains a script that automatically compiles the MEX files before running. In the future, I may provide a deployed version for those without access to MATLAB.
Also on the menu to the left is the manual in .pdf form which includes: installation instructions, in-depth step by step instructions on how to use Ncorr, and suggestions/tips for the overall DIC analysis. I recommend viewing this manual (and also visiting the "DIC Algorithms" page) before using Ncorr.
Lastly, the user can download sample images (taken from SEM's DIC challenge and also from my lab) on the left to follow the user guides in the manual.