Download the latest version of LISEM Classic here: http://sourceforge.net/projects/lisem/
LISEM Classic: HERE
List of versions and changes: README
LISEM runs with the freeware GIS PCRaster
New LISEM : HERE
LISEM is an open source development (GNU GPL v2.0 licence). Using the compiled model or (parts of) its sourcode implies that you are familiar with the details of this licence.