The current release of peakfinder can be downloaded from the "Files" section of the project page at http://sourceforge.net/projects/peakfinder/.
Alternatively, the latest source files can be retrieved from the CVS repository.
cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/peakfinder login cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/peakfinder co -P peakfinder
When prompted for a password for anonymous, simply press the Enter key.