Whatever is the version you wish to use, simply put the downloaded GeoPrisma directory it in a web accessible directory, such as htdocs.
If you have SVN installed, you can checkout the trunk version of GeoPrisma by typing the following command in a shell :
svn co https://svn.osgeo.org/geoprisma/projects/geoprisma/trunk/
It is recommended to do so :
See also
Bundles are available at the GeoPrisma website , under the Download tab. It is a minimized and static version of the current GeoPrisma trunk. The directory structure is slightly different than the real trunk version.