The manual for DMAG9b (dmag9b_manual.pdf) is in the ugosoft3d-9x64.rar archive. There is also a test case you can try under dmag9b_test.
The behavior of DMAG9b is controlled by an input file called "dmag9b_input.txt". What the parameters mean and do is explained in the DMAG9b manual. The parameters that have the highest impact on depth map quality are the spatial sample rate (try 4, 8, 16, 32, etc), the range (color) sample rate (try 4, 8, 16, 32, etc), and lambda. The others don't matter so much but feel free to read the DMAG9b manual and experiment with those other less important parameters (especially the ones that control the confidence map). There is no one set of default parameters that will work equally well for all images, so it is best to run default parameters and then experiment to get an idea of what the various parameters do.
Here's an example:
Depth map obtained with Depth Map Automatic Generator 5b (DMAG5b) using radius = 2.
Here is a video tutorial:
Interested readers may want to consult Depth Map Improvement Using The Fast Bilateral Solver for a more in-depth look into DMAG9b.
The windows executable (guaranteed to be virus free) is available for free via the 3D Software Page.