The NCAlgebra homepage address is
http://math.ucsd.edu/~ncalg
It can also be easily found by searching the web for NCAlgebra.
In the first line of text, there is a hyperlink attached to the word downloaded (i.e.,the word downloaded is underlined). Click on the word downloaded and you will move to a world-wide-web page with several choices as to what you might load. Click on the appropriate hyperlinks. (Some versions of Netscape require you to shift-click to download a file.)