which version are you looking for, or you not quite sure?
current standing version, Netpumper v1.10.2
Netpumper v1.02
http://intra.inst-econ.org.ru/files.shtml
NetPumper 0.96 beta
http://download.netpumper.com/netpumper-0.96-setup.exe <-- direct link, else ya can find it on this page
http://members.lycos.co.uk/ivgi/PROG/120702.shtml
netpumper-0.95-setup.exe
http://download.netpumper.com/netpumper-0.95-setup.exe